Kryptonite Avenue R-30 bicycle rear light Make sure you are clearly visible with this bicycle rear light from Kryptonite. The memory function of the light will turn on in the last mode in which it was turned off. With the built-in battery indicator you can see how much battery charge the lamp has. As soon as the charge is 25%, the indicator light turns red, as soon as the percentage is 100%, the light turns green. The built-in battery can be charged via a USB cable. Specifications; Color: black Color lamp: red Material: plastic Power supply: battery (integrated) Battery life: up to 7 hours and 30 minutes Dimensions: 8.4 x 22.8 x 4.5 cm (L x W x H) Weight: 0.15 kilograms