VDO rear light The small Eco Light Red has a strong beam of light. You are visible up to 400 meters. The lamp is not even as big as your thumb, fits perfectly on the seat post and is very light. In the dark, however, a lot of light is provided to make you visible to others. Two bright LED lights guide you on your way. The lamp burns for up to 7 hours and is rechargeable. Specifications: Color: black Gender: unisex Material: plastic Dimensions: 4 x 2.3 x 1.5 cm Power supply: rechargeable via USB Weight: 21 grams Visible up to: 400 meters Closure: 2-O rings