Remote Control - Signal Pod is a wireless control system, installed on the head of the bicycle, easily controls the function of the rear light for more safety during cycling. 2 in 1 design, can be used as rear light (turn signal/steady) and turn signal (left/right). With three settings, the LED arrows light up to indicate "left", "right" and "dangerous" such as a car or motorcycle. Long-lasting illumination: This bicycle tail light is USB rechargeable , can work up to 8 hours in flashing mode after 2 hours fully charged. IPX2 waterproof: IPX2 waterproof function can withstand rainy days and humid climate, waterproof designed for outdoor cycling air. Streamline Light-guide LED: Good quality with red-yellow dual color LED. Someone is following us who is without USB charging and only battery