This taillight has one powerful LED, so you are clearly visible. The lamp is easy to mount on a seat post and works on two supplied AAA batteries
Specifications:
Color: red, black
Material: plastic
Type of lighting: led
Seal of approval: STVZO (German)
Dimensions: 7 x 3 x 3 cm (LxWxD)
Batteries: 2 AAA batteries (included)
Clamp diameter: 22.2 to 31.8 mm
Mounting: to seat post