KingNeed T16 Bicycle GPS Tracker with Bike LED Tail Light, Hidden GSM Security Alarm/Anti Theft Lost/Remote Lock Hidden GPS Tracker + GSM Alarm, looks and works just like the LED Tail Light Works up to 30 days in regular daily usage with 5200mAh rechargeable battery Motion powered LED works in flashing and steady modes and visible from any angle IPX7 water-proof design, light weight and durable Easy to install, the installation is same as a regular tail light, comes with backpack clip, and seatpost mount attaches with tools