【Wireless remote control】 4 buttons on the wireless remote control, the remote control bicycle tail light send signals in different modes. The handlebar remote control is easy to control by the rider while riding. Suitable for mountain bikes and racing bikes. 【Rechargeable by USB】 Built-in 700mAh battery. It comes with a charging cable that can be charged from a computer, mobile power adapter, or any device with a USB port. Charging may take 2-3 hours, may take up to 15 days, may take up to 60 days. 【Three modes】 Flash / Medium flash / Continuous light. Anti-theft tail lights and alarm tones can shake off thieves and alert bike owners. This bicycle anti-theft device can ensure your safety and that of your vehicle. 【Easy to carry】 The remote control can be mounted on the bike or carried. It can be kept in a pocket or pocket. 【Easy to install and use】 Convenient clip can easily be attached to the bicycle handlebars. Refer to the illustration for installation information. If you cannot find your car in the parking lot, you can also find it quickly by pressing the alarm on the remote control. Product descriptions Functionality 100% brand new and high quality. Easy to install. When the alarm is latched, it is sensitive to vibration. Protect your bike from stealth theft. Use a vibration sensor to detect. When certain vibrations are detected, a very loud alarm sound is immediately generated to deter the thief. A remote control is attached, which increases convenience. The practical clip-on mounting seat can be easily mounted on the bicycle handlebars. The sturdy shell is durable and can be used for a long time. It can be used when the distance between remote control and siren is 10-50m (open distance) and can pass through the wall Specification Battery capacity: USB rechargeable lithium battery with 700 mAh (3.7 V) Charge the device for 2-3 hours, up to 15 days and up to 60 days in standby mode Lamp beads: COB bright light source A (red button) for flash model switch B (blue button) is the calibration code button which is used to reset the light to working state if needed Battery for remote control: alkaline battery 12V / 27A Alarm tone: 105-120db Remote control distance: 10-50m (open distance), can pass through the wall Applicable models: Normal installation is suitable for bicycle saddles with 5-7cm spacing (bikes of all models and sizes). Material: plastic Black color Quantity: 1 set of Package includes: 1 set of alarm system