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Pairs well with
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Free standard shipping orders over $100
Processing time: in 48 business hours. | Shipping time: 5-10 business days
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14 DAYS PRICE PROTECTION
We will give you a refund for the difference in price if the item you bought from our official website is available for a lower price within 14 days.
Given that other versions of treadmills are sold in other countries, we will only protect your price for the same version in the same country you bought it.
Please Contact us with your order number if you need
help.
30 DAYS RETURN
If you are unhappy with your purchase, as long as you contact us within 30 days from the receipt of the item, we will process your return/exchange request. Any request after 30 days will not be honored. Please make sure to contact us by email (contact@kingsmith.com) at first.
Return & Exchange Conditions
w Items returned without authorization will not be accepted.
w Items must be returned within 30 days after you receive them.
w All items must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
w When returning or exchanging items, customers must use a shipping method providing tracking information.
Non-returnable items:
w On sale items or gift cards are non-refundable.
w Damage/Lost caused by customers is non-refundable.
General Return Process
w Initiate a return: Please email us at contact@kingsmith.com with photos and/or videos of the items and let us know your order number. Our customer service staff will determine the eligibility for your return request within 3 business days.
w Ship the item back: If your return is accepted, we’ll send you the return address, as well as instructions on how and where to send your package. (Note: Items returned without authorization will not be accepted). We recommend that you send your return/exchange in a shipping method providing tracking information as well as a signature, because we will not be responsible for lost return/exchange.
w Refund or exchange: when we receive your return/exchange, we will inspect the item in 3-5 working days and then provide a replacement for an exchange or issue a refund.
Return Charge
w If the return is due to our problems (such as: incorrect products, quality problems of products), we will provide a full refund for you include the return freight;
w If the return is due to the buyer’s problem (such as: don’t like/want the item, ordered a wrong product/size), the buyer should pay the return freight.
w No restocking fee to be charged to the consumers for the return of a product.
Refunds
w Once your return is received and inspected, we will notify you of the approval or rejection of your refund. If you are approved, the refund will be provided to the original method of payment within 2-3 working days.
w If you haven’t received the refund within 2-3 working days, please check your bank account again. Then contact your bank or credit card company. It may take some time before a refund is official posted. If you’ve done all of this and you still have not received your refund, please contact us at contact@kingsmith.com.
Please Note: we do not refund our original shipping cost.
Order Cancellations
w We can cancel the order for you if you contact us in time after your purchase. If your payment finished and the parcel is not shipped out, you can cancel your order before your item’s delivery. And we will refund full of your money.
w Orders can't be canceled once the parcel is shipped out.
Email: contact@kingsmith.com
Tel: +1 888 292 4009
Address: 3901 E. Plano Pkwy Unit A23 Plano, TX 75074,US (Note: This address is not the return address)

X21 Double-Fold Treadmill
Product details
Description
The King Smith X21 is a minimalist’s dream! This stunning ultra-thin folding treadmill has won several design awards including the Red Dot Award and IF Design Award for impressive visual design and the patented double-fold technology. Gone are the days of ugly treadmills and cheap walking pads, we are proud to offer a space saving and space enhancing way to run and walk at home. The X21 by King Smith is a refined treadmill in both form and function.
- Innovative Folding Treadmill: The double-folding feature reduces space by storing upright against a wall or in a closet.
- Easy and Intuitive Control: A simple twist of the Speed Dial increases the speed, no more struggling to push a button while walking.
- Stay on Track: All your workout information is stored in the KS Fit app to help keep you progressing toward your weight loss goals.
- NFC Pairing: The interaction interface can be accessed directly using NFC (For Android).
- Detachable Phone Holder: Walk while you watch a show or viral video with your phone conveniently close.
- Built Beautifully: This stunning treadmill is not just built to last, finished in classy black the X21 is one good looking treadmill.
Technical Parameters
Technical Parameters | |
Product Name : | WalkingPad X21 Foldable Treadmill |
Speed Range : | 1 - 7.5MPH / 12KPH |
Running Area : | 47″ * 18″ / 1200 * 460mm |
Weight Capacity : | 243 lbs / 110KG |
Motor : | 1.25 HP Brushless motor |
Net Weight : | 82 lbs / 37KG |
Gross Weight : | 93 lbs / 42 KG |
Remote Controller : | No |
Speed Adjustment : | App | SpeedDial knob |
Handrail Adjustment: | NO |
Foldable: | YES |
Assembly: | Fully assembled |
Shock Absorption: | EVA & PET |
Product Dimensions | |
Folded Size : | 39.6″ * 27.9″ * 8.8″ / 1007 * 711 * 225mm |
Unfolded Size : | 55.8″ * 27.9″ * 41.4″ / 1419 * 711 * 1053mm |
Packaging Size : | 43″ * 31″ * 10″ / 1102 * 795 * 264mm |
Package Included | |
WalkingPad * 1 | Power Cord * 1 |
Phone holder * 1 | Safety key * 1 |
Wrench * 1 | User Manual * 1 |
Additional Option | |
APP : | KS Fit |
Apple Watch : | Yes. Connect the KS Fit app to your iPhone and pair it with your Apple Watch. If heart rate data doesn't appear, ensure both devices are properly connected. |
Color option : | Silver Gray |

Folding & Refined Fitness
Our ultra-thin X21 folding treadmill folds vertically to size of a suitcase so you can exercise and then easily move it out of the way. This is truly the best treadmill you will find, it fits almost anywhere in any size home.
Everything Within Arms Reach
All the controls are built into the Speed Dial. Press to start, turn right to speed up, left to slow down and when done, a light press brings you to a gradual stop. The speed ranges from 1 - 7.45MPH.

Superior Looks, Superior Quality
We built the X21 slim treadmill with an all-aluminum alloy frame coated in a black finish. The end result is a stunning and stable treadmill that is built to last.

NFC Connected Control
Use the free KS Fit app to access all your workout data and even control your X21 slim home treadmill via the NFC. smart sensors.

Run Upstairs While they Sleep Downstairs
Barely audible for you and anyone nearby. No worries about getting your workout in while others sleep in the room next door or the floor below.

4-Layers of Cushion and Comfort
Running outside on the pavement is hard on your body. We have built the X21 slim treadmill to remove some of the impact so you can keep going.
FAQs
Please read our FAQs page to find out more.
How to change the rotating display from Chinese to English?
I hope the following methods can help you: 1. Press and hold the X21 thin treadmill control button for 3-4 seconds, and plug in the safety key(Keep the control button pressed) and enter the engineering mode (when your distance below shows F1, you have successfully entered the engineering mode).
2. After entering the engineering mode, switch the settings by pressing the control button until the calorie panel shows CH, turn the knob a little to the left until the calorie panel shows EN, and after successful switching, press and hold the control switch without releasing it, and after 3 seconds you have successfully switched the language. Please let me know if you have any questions.
How heavy is this when you've used it and want to fold it up and put it away?
King Smith x21 ultra slim folding treadmill for home is 38kg (84lbs), and it has two wheels and a handrail to wheel it away, so it can be moved easily.
Can this also be stored horizontally under a bed?
Yes, of course. The x21 foldable slim treadmill can be placed flat or vertically against the wall, and it's more convenient to put it upright.
Are you able to run at a decent pace with this or is it mostly just for walking?
x21 super slim treadmill tops out at 7.5 MPH, it's a quick enough speed to start a full-speed run.
How fast does this go? Does it incline?
The fastest speed of the x21 slim running treadmill is 12km/h. Because the design of incline will affect the usage of fold function, x21 treadmill isn't incline.
Does my treadmill slow down when I step on it?
It doesn't. Because the x21 foldable treadmill doesn't contain walking mode, only holds running mode, the x21 can't adjust speed by feet, then it can't slow down when step on it.
How treadmill helps to lose weight?
The x21 slim fold treadmill is portable and convenient to store, which avoid your workout be stopped by bad weather and busy work, and offers more freedom for you to exercise, push you to move more, burn more calories and increase metabolism, then lose weight.
Where to store treadmill?
Used double-fold tech, with the help of rollers and handrail, x21 can be placed flat or vertically against the wall, and it's more convenient for put upright, only need a small place, you can store x21 slim treadmill.
Why treadmill running is good for you?
Because x21 portable slim treadmill adopts high-end patent wear-resistant material on the EVA buffer layer, which ensures high cushioning ability to protect our ankles and knee, you don't need to face the muddy road, and poor weather can't stop off your workout, so x21 is the best buy under desk treadmill at home for you to keep health and safety.