The very light 35 g Airstream tail light draws its energy from the large main battery of the front light and therefore does not require its own power source. This probably makes it the smallest rechargeable battery rear light in the world.
The Tail Light is simply plugged into the charge port of the Airstream and is automatically recognized by the intelligent electronics. Powering the three bright red LEDs only reduces the burn time of the Airstream by 10 minutes. The universal seat post clamp fits all seat post sizes and keeps the light safely attaced to the bike. With the reliable Airstream tail light you can forget all the worries you had with failing and falling-off plastic rear lights.