The built-in gyroscope sensor can detect the flight status of the drone sensitively and efficiently. When a drone crash is detected, the alarm buzzer be automatically turned on. Equipped with high-brightness LED lights and light sensors, the LED lights flash and automatically turn on when dark light is detected. It is still convenient to find the drone at night. Built-in 80mA lithium battery, it can work independently without wire connection, and can theoretically be used on all types of aircraft. Equipped with Micro-USB interface, supports any 5V DC input to charge the battery. The maximum volume in the alarm state can reach more than 110 decibels, and the loud beep help you find the lost drone as soon as possible. Buzzer maximum decibel: over 105dB Working time: over 30 hours Charging time: 1.5 hours Battery capacity: 80mA lithium battery Charging voltage: 4.5V-5.5V (The product printed words depending on the batch, but this does not affect use) Color: As Shown Material: plastic Package Contents: 1 x for FPV Finder 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.