Usage Tips:The Bicycle Light Alarm is a multi-functional accessory for your bike, featuring a wireless alarm system, waterproof design, automatic brake induction, remote control operation, USB rechargeable taillight, and a built-in horn for warning signals. Keep your bike safe and enhance visibility with this device. Made with high-quality materials to long-term use To enhance the safety of your bicycle Alarm sound: Warning sound up to 120 decibels Circuit board: integrated molding of fiberglass board and SMT machine Tool: Standard installation tool with inner hexagon Remote control distance: 1-100 meters (in open areas) Battery life: Normally used, the battery can be used for more than 15 days by repeatedly operating it 5 times a day, with a standby time of over Remote control battery life: The battery is used normally for 8-12 months Beads: COB high brightness light source Battery: Polymer lithium battery 700mAh Colour:Black Material:ABS Size:9x4.5x2.7cm Package Contents: 1 x Tail lights 1 x Remote control mounting bracket 1 x Tail light installation bracket 1 x Remote control 1 x USB charging cable 1 x Shim 1 x Ties 1 x Inner hexagon 1 x Instructions in Chinese and English Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.