This Matek Lost Model Beeper & FPV FC 5V Loud Buzzer is perfect for FPV racing enthusiasts. It can be used on traditional PWM receivers or FPV racing flight controllers. The buzzer is small and lightweight, with dimensions of 18x13x8mm and a weight of 2g. It has a built-in MCU, a working voltage range of 4.5 - 5.2V DC, a maximum power of 1W, and a maximum sound output of 90dB.