Features： 1、Intelligent alarm and COB light source, wireless bell and USB charging. Designed with remote control, wireless signal transceiver, stability and strong signal transmission. 2、120 high decibels, press the lock button on the remote control for protection state, once the bike touch and vibration, it will issue a harsh alarm, the 1st touch warning for 3 seconds, touch again after the warning 2‑12 seconds, it will alarm for 30 seconds. 3、COB light chips, 120lm and luminous uniformity, 200 meters away is still visible ensuring safe night riding. Wireless bike search function, remote control vehicle light to send bell sound for quickly find the location of your bike at any time even at dark night. 4、Charging for 2‑3 hours, normal use can last about 15 days, standby can last more than 30 days. Integrated headlamp can be installed in bottom of the bicycle saddle steel tube. 5、Convenient to install. Remote control can be conveniently installed on the base or handlebar, and easily removed and installed. Please remember to take the remote control away when you go. Specification： Item Type: Bicycle Taillight Material: PC+ABS Taillight Size: Approx. 9 x 4.5cm / 3.5 x 1.8in Remote Control Size: Approx. 5.5cm / 2.2in Light Chip: COB highlighting light source Taillight Power Supply: 800mAh polymer lithium battery Remote Control Battery: 1 x 12V/27A alkaline battery Charging Method: USB charging Waterproof Rating: IPX-5 Applicable Models: Normal installation is suitable for bicycle saddle, bracket width distance is 5 ~ 7cm / 2 ~ 2.8in(no limit on bicycle model and size) Description of Remote Control Button: Protection Button: Press and sound 'Bi..Bi..Bi..'Three times, the light flashes for three times, and after three seconds, one beep sound and enter the protection mode. Leave three seconds in case you accidentally trigger the alarm, which is convenient for people to leave the bike. Cancel button: press and sound 'Bi..A long ring, long light, that is to remove the protection. Taillight warning button: short press to switch three taillight modes, three speed cycle, fast flash/slow flash/constant light. Electric bell/bike search button: press the button, the light will flash 3 times and the horn will sound 3 times. Long press, the lamp strobe and flashes 3 times, after the horn rings 3 times, the lamp shines again for 3 seconds, and the horn rings for a long time. Package List： 1 x A6 Tail Light  2 x Hex Socket Wrench  1 x Gasket 2 x Taillight Screw  1 x Seat Post Mounting Rack Screw 1 x Saddle Mounting Rack Screw 1 x USB Cable  1 x Manual  1 x Remote Control  1 x Remote Control Mounting Rack  1 x Seat Post Mounting Rack 1 x Saddle Mounting Rack 2 x Cable Tie