Magicshine Seemee 50 Mag Taillight. Features: Equipped with red and white lights, allows use as a front light or taillight PelotonSync Flash Intuitively harmonizes flash patterns among nearby compatible taillights, amplifying visibility and team style on the road LightSync Control technology, synchronizes Seemee 50 Mag with compatible Magincshine front lights for intelligent one-touch control via remote 350mAh battery lasts up to 18 hours on a single charge lPX6 waterproof rating guarantees continuous operation in the harshest conditions Mounts with included seatpost bracket or by using any Garmin style mount USB-C rechargeable Specs: Model:Seemee 50 Mag Lumens:50 Modes:5 Rechargeable:Yes Color:Black Weight:38g