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  • Model Number: foldable electric bicycle
Product Description

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Watch this link by computer, you will see the AIR WHEEL real video

IMPORT TAX
Spain France and part of Israel customer need pay import tax.
We will do our best to reduce your import tax. but  we do not offer refund of import tax.
Customer refuse to pay tax will loss money and stroller.
PARCEL BROKEN
Please ask the courier issue a broken package certificate and accept it. 
You will get refund from Shipping company.
BIKE PROBLEM
We will check quality before sending you, but some small part may broken while shipping.
We will send you replace part free shipping.
ACCESSORIES MISSING
You can get refund of it.
If you still need it, we will send a new one free shipping.
QUALITY GUARANTEE
7 days: free replace part or refund.
60 days: pay only cost of replace part and air parcel shipping cost.
Shipping Time
We do not accept urgent order, goods reach most city around 7 days, russia 20 days, but we do not promise it reach on time.
MODEL (K1) DOUNA K1 folding electric bicycle MODEL(K1) DOUNA K1 folding electric bicycle 
Net weifght 9.8kg Battery LG Lithium battery 48v 2.9ah
Folding Size 420*160*520mm Wheel Size 10Inch 
Max. Load  ≤90KG Charging Time 2H
Max.Speed 20km/h Voltage 48V
Rated Power 240w External Size 1245*450*910mm
Grade of Waterproof IP54 Out packing Size 530*190*490mm
20GP/40GP/40HQ 500/980/1200PCS Cruising Distance 12-15KM
 K1QQ APP-(12)  K1QQ APP-(11)
impossible electric backpack bike 1 impossible electric backpack bike 2 impossible electric backpack bike 3 impossible electric backpack bike 4 impossible electric backpack bike 5 impossible electric backpack bike 6 impossible electric backpack bike 7 impossible electric backpack bike 8 impossible electric backpack bike 10 impossible electric backpack bike 11 impossible electric backpack bike 12 impossible electric backpack bike 13 impossible electric backpack bike 14

1,   Where is the battery?

      Battery is researched and developed by ourselves, it is hidden in the front wheel.

 

2,   Will it seep water?

      The Waterproof Rate of the wheel is IP54, we have done Waterproof and dustproof experiment for thousands of times in our laboratory. So the wheel will not seep water, you can ride it normally in the rain or even snow weather.

 

3,   What is the battery type and capacity? How about the driving mileage per charge?

      The battery is lithium battery, the capacity is 2900mah, the distance per charge is 15km.

 

4,   What’s the charging time?

      The charging time is 2 hours.

 

5,   Now that it’s a electric bike, where is the motor, I can’t see it at all?

      Motor is also researched and developed by ourselves, it is hidden in the rear wheel. It’s Brushless wheels motor, the rated power is 240W, the max speed can reach 35km/h, but we have limited it within 20 km/h according to the national safety standards.

 

6,   What is the whole bicycle weight?

      The whole bicycle weight is 9.8kg, amounting to 1 bag of rice , you can lift it easily.

 

7,   How about the load capacity?

      The max load capacity set by national standard is 75kg, in fact our actual max load capacity can reach 90kg. The perfect combination of  aluminium alloy and dual loop structure design can skillfully balance thepressure onto the bicycle body, make it more even, make the riding more stable. 

 

8,   Is it easy to fold?  Is it big after folding?

      It’s easy to fold, just need 4 steps to get ful-folding. This whole movement only take you 30 seconds. It also can realize half-folding in one second to pull model, it’s very convenient for you to take bus or subway with DOUNA. weight is 9.8kg, amounting to 1 bag of rice, you can lift it easily.

 

9,  This is an intelligent electric bicycle, what’s the intelligent point?

       We put an Intelligent MCU controller in the bicycle, it has Bluetooth 4.0 module, GPS positioning module and SIM card module. In addition, every car have its own identification code, like a id card, you will be the only owner once you binding the bicycle with your cell phone, then you can monitor the bicycle through our APP, including locking and unlocking the bicycle, GPS positioning, checking the speed, battery state and driving        

 

 10  Does this product have any patent?

        Douna K1 obtained more than a dozen patents including the European appearance patent; there are also more than a dozen patents in the declaration, including the United States patent and the international PCT patent.

30S FAST FOLD
TB2W9RicHaI.eBjy1XdXXcoqXXa_!!82952861  K1QQ APP-(20)
WHEEL BUILD IN BATTERY AND MOTOR
TB2WHDdXZgd61BjSZFEXXaBjVXa_!!82952861  K1QQ APP-(9)  K1QQ APP-(10)
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SPECIFICATION
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Foldable bikes have always promised flexibility for bikers. 
 
But most end up being far too inconvenient to ever use in a city. They are often too expensive, difficult to ride, and too big or heavy to realistically carry around with you. 
 
It seemed as if finding a bike that is small enough to be portable, and lightweight enough to be carried around was unachievable.
 
But that’s where the aptly named the ‘impossible’ bike comes in.  
 
This lightweight bike can be easily folded to fit inside any normal backpack, weighs less than 11 pounds and is a mere 17 inches tall when folded, according to CNET — plus, it\'s electric. 
 
Impossible BikeImpossible Technology/Kickstarter
 
The designers of the bike realized that the only way to accomplish the challenge of making a bike completely portable was to build an entirely new bike design — one where the frame of the bike was built around circles instead of lines.
 
So, after three years of development, they created a bike that unfolds through a series of circles in four simple steps: 
 
Impossible Bike Impossible Technology/Kickstarter
 
The bike is made from carbon fiber to ensure that it is extremely lightweight and durable. The connecting box in the frame’s middle is made from steel so that it can actually carry the weight of a person. 
 
The ‘impossible’ even saves space by combining the function of the bike seat with the carrying case. 
 
Impossible Bike (updated step 2)Impossible Technology/Kickstarter
 
Through these steps, the \'impossible\' transforms from a tiny backpack-sized package into a full scale e-bike:
 
Impossible Bike Impossible Technology/Kickstarter
 
The bike doesn’t actually have pedals, which means that if you run out of battery you’re pretty much out of luck. While this may seem like a major drawback, the designers explain that adding pedals or other chain structures would take up more space and make the bike heavier (and thus making it less portable). 
 
The bike will be built with a brushless electric motor and will be able to travel up to 12.4 mph for 45 minutes.
 
At slower speeds, the bike can take a person about 15.6 miles before it needs a recharge, which is far longer than most urban commutes. The designers will also be making extra batteries available, so if you ever run out of battery on the bike, “you always can fold it into your backpack and walk to a close-by coffee shop,” to recharge, according to the Kickstarter page. 
 
Other difficulties include the small wheels (which might pose a problem for commuters who face difficult road conditions like potholes) and that the bike has a weight limit of 180 pounds. 
 

But overall, this seems like a pretty clever design for urban commuters. It would be perfect for getting around between public transport, or just for those exhausting days when walking home seems like an unachievable feat.  

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Packaging Details
  • Unit Type: piece
  • Package Weight: 11.0kg (24.25lb.)
  • Package Size: 28cm x 57cm x 108cm (11.02in x 22.44in x 42.52in)
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Packaging Details
  • Unit Type: piece
  • Package Weight: 11.0kg (24.25lb.)
  • Package Size: 28cm x 57cm x 108cm (11.02in x 22.44in x 42.52in)
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