Riding security : When riding a bicycle with the bike turn signals, in order to provide security for your outdoor riding, you can use the remote to control this intelligent bike tail light with turn signal, to give backward driving vehicles light signal hints including left and right steering, parking and brake warning. Using Remote controller to combine the bright LED tail light perfectly to get drivers attention from blocks away. Easy Installation : Take the bike turn signal light and the fixing bracket from the box, and slide the bike light into fixing bracket along the groove and buckled. Place the bike turn signal on the bicycle seat tube and tightened with screws. The appropriate seat tube diameter from 1-1.3 inches. Take out the remote control and attach it to bike handle and it can be tightened with just the hands. The appropriate bicycle handle from 0.7-1.1 inches in diameter. Extreme Long Endurance : The bike turn signals uses a 2200 mAh 18650 Li-on USB rechargeable Battery, allow the bike taillight to be fully charged in 3 hours and the taillight has a Runtime of 8+ hours; The Wireless Remote Control 's battery can keep working for 2 months without charging the battery. Save your money and hassle, never waste Your money on batteries again You can charge the taillight from any USB port. Battery status check : When the bike turn signal is turned off on the bike tail light, short press the power button on the bike tail light and red LED lights will indicate the current power by the length of the red light bar representing the amount of electricity. They will have 15 red L.E.D.s on the bike tail lights that indicate the power status. Tips: TIPS: Power on button is on the front of bike taillight, if not switch on, the Remote is not available, If you want to turn off your bike taillight please power off this button, The remote can not turn the power off from the tail light, it will just be on standby. When riding a bicycle, in order to provide security for your outdoor riding, you can use a remote control to control this intelligent turn signal to give backward driving vehicles light signal hints including left and right steering, parking and brake warning . This is a Bicycle safety warning light as well as a bike turn light signals,This is a bright L.E.D light with a wide beam angle, this USB bike taillight is rechargeable and has a very compact design, easy to carry, and has a IPX4 Waterproof design, great for light rain with a Quick release buckle design, and very easy to Install for Most of Bikes