Remote Control - Signal Pod is a wireless control system, installed on the bike head, easily controls the function of the rear light for more safety while 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 bike taillight 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. Streamline Light-guide LED: Good quality with red-yellow dual color LED. Maso Tailight with USB charger and comes with a battery and a spare battery ！！！ Someone is following us who is without the USB charging and only one battery Please check before buying Product size: 12.5*4*3.7cm. Shipping quantity: 1 piece.