NOTE: Please pair the tail light and the remote control before using it. S3 remote controller how to pairing with the tail light/bell: 1, Turn off the tail light; 2, Long press and hold the power button on the tail light (about 3 seconds), until you hear 3 consecutive beeps: ba ba ba，and the tail light enter the pairing mode; 3, Then shrot press the power button on the remote controller，you will hear two sounds: ba ba, and the tail light LED start flashing, paring is successful.
【LOUD VOLUME】Professional sound chamber design, clear and loud ringtone, 120DB loud volume, suitable for most mountain bikes and road bikes. There are five ring tones to choose, use the remote control to choose what you like.
【MOBILE ALARM FUNCTION】one button to open the alarm function (long press the front button on the remote control), when the bicycle is moving, it will make a loud alarm sound, enough to shock and scare the thief, relief your worries of the theft.
【USB RECHARGEABLE AND WATERPROOF】built-in 400mAh lithium battery, fully charged 1~2 hours, use time MAX10 hours; IPX5 waterproof, never worry about the rainy days anymore.
【EASY TO INSTALL】complete the installation in seconds, you can choose the installation location (seat post, pipe, head tube); wireless control, very convenient, you can adjust any time without turning back.