Product information:  

Product Name: Wireless Smart Turning Tail Light Bead Type: LED
Battery capacity: 500mah lithium battery
Light color: red light, turn to yellow light
Charging time: 2 hours
Product color: black
Life time: 2.5 hours
Product size: 8.5*2.2*2.2cm
Voltage: 3.7V

Size Information:   

Product size: 8.5*2.2*2.2cm