Features:

• The Safe Led Signal Pack for Running, Cycling, Walking, Motorcycling;
  
• USB Rechargeable,save power. Built in lithium Battery,easy to charge the pack.
• Wireless control,safely use when riding.Tied the wireless transmitter on the bike,so you never has to take their hands off the handlebar.
• The wireless signal does not interfere with each other, if Multi-user are using it at close range concurrently.
• It has 4 Led signals: left, right, forward, stop, from turn signals to emergency signals, to reminder drivers for keeping their distance.

The Safe Led Signal Pack for Running, Cycling, Walking, Motorcycling:
The wireless signal does not interfere with each other, if Multi-user are using it at close range concurrently. 
Specifications: 
Main function: turn signal for cycling, traveling, hiking, etc. 
Working frequency: 2.4 GHz 
Waterproof level:PIX-5 
Transmission distance: 3 meters (depending on the surroundings) 
Battery of the transmitter: 2 pieces of button cells 2032 (Non-rechargeable) 
Battery of the receiver: Built-in 850 mAH lithium Battery (Rechargeable) 
Working time: 24 hours 
Charging: DC 5V 500mA or USB 
Material of the receiver pack: nylon, oxford fabric 
Shell material of transmitter: PC ABS 
Turn signal pattern: right, left, forward, stop 
Storage Temperature: -30℃ to 
Operating Temperature:-10℃ to 60℃

About 5liter Signal BackPack
This is a 5Liter small backpack, and include signal control, if you have not a backpack, you could choose it, or best gift for your children.

What's in the package: 
1 x Led Cycling Turn Signal Pack 
1 x Remote control 
1 x Controller Connector 
1 x User Manual