This is an intelligent bike turn signal light. It shows your turning directions automatically when you turn left or right, or stop. So it can send signals to the drivers of the rear vehicle, which prevents some accidents effectively. 

• Built-in rechargeable battery is recyclable and convenient to use
• Fast charging and the less charging time (3.5 hours)
• Water-resistant and practical; even on the rainy day, it still works
• Automatically sense the direction of the bicycle and show it on the display screen
• LED light display screen helps to give the signal to the drivers of rear vehicle
• Easy to install and replace

Specifications:

• Material: engineering plastics 
• Battery: polymer lithium battery, 1200mAh
• Lighting parameters: 64 LED lights, infrared ray warning 
• Lumens: 80LM
• Charging time: 3.5h ± 30min
• Item size: 70 * 58 * 30mm / 2.75 * 2.28 * 1.18in
• Item weight: 66g / 2.33oz

Note: Please allow 1-2 cm measuring deviation due to manual measurement.