The backpack lights up with messages for traffic behind the cyclist, from turn signals to emergencysignals, to thanking drivers for keeping their distance. 

The display is made of LEDs and works in one modes, driving. Driving mode shows turn signals, forwarding, left, right, stop. The display is controlled by a controller tied on the bike, so the cyclist never has to take their hands off the handlebar.

We'd definitely love to see something like this available for cyclists, though it's probably possible to create something on your own if you really want one.

Parameters:

l Main function: Lighting, warning, security etc.  

l Working frequency: 2.4 GHz

l Transmission distance: 3 meters (depending on the surroundings)

l Battery of the transmitter: 2 pieces of button cells 2032 

l Battery of the receiver: Built-in lithium Battery (650mAh)

l Working time: 24 hours

l Charging: DC 5V 500mA

l Shell material of transmitter: PC+ABS

l Material of back pack: Dacron 

l Product Size: 235mm*240mm*15mm

l Elastic strap length: 185mm, 300mm(stretched)

l Weight : 169g 

l Package: Gift box

l Turn signal pattern: right, left, forward, stop

l Product Accessories: a transmitter, a receiver, a user manual, four zip-tights

l Certificate: CE, FCC, ROHS

l Storage Temperature: -30°C to 80°C

Operating Temperature:-10°C to 60°C