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The JHE20B is a compact, self-powered alarm module for FPV racing drones and multirotor aircraft. It combines a traditional active buzzer with an independent backup alarm system, so pilots can locate crashed or lost drones quickly.
A 100dB alarm and a bright white LED help with recovery in low light, dense grass or long-range flying. The module works with most Betaflight and Cleanflight flight controllers and connects directly to the flight controller's buzzer interface.
The backup power feature starts the alarm about 30 seconds after the main flight battery is disconnected, so the buzzer keeps working after a crash or battery ejection.
Dual operating modes: standard active buzzer and automatic self-powered lost-model alarm.
100dB alarm: helps locate crashed drones quickly.
Built-in backup power: keeps alarming after the main LiPo disconnects.
Bright white LED: visibility for night flying and dark areas.
Automatic activation: about 30 seconds after power loss.
Easy reset: hold the release button for over 2 seconds.
Red charging LED: shows charging and operating status.
In its normal mode a buzzer module behaves like any active buzzer: connect it to the buzzer pad of the flight controller and it sounds with the arming and warning tones. While the flight controller is powered, an internal circuit charges a small cell, and an LED shows the charging state.
If the main power disappears, the module waits for about 30 seconds and then runs its alarm from the internal cell. This makes it easier to find a drone whose battery has been thrown off in a crash or has failed.
After you recover the aircraft, hold the button for more than two seconds to silence the alarm. Make sure the module has a full charge from the flight controller before you fly, and check that the buzzer pad supplies 5V.
Finding crashed FPV racing and freestyle drones
Long-range UAV builds
Recovery in dense grass or low light
Standard buzzer duty on Betaflight and Cleanflight
Lightweight mini quadcopters
The module runs from 5V and weighs 2.7g with dimensions of 22 x 12 x 9.5mm. It connects to the flight controller buzzer interface using the included 3-pin 1.0mm line.
The listing states compatibility with Betaflight (BF) and Cleanflight (CF) flight controllers.
Brand: ReadytoSky
Operating voltage: 5V
Alarm sound level: about 100dB
LED: white
Dimensions: 22 x 12 x 9.5mm
Weight: 2.7g
Activation: about 30 seconds after power loss
1 x JHE20B finder
1 x 3-pin 1.0mm line
FPV pilots who want a very light, self-powered buzzer to find a lost quad.
About 100dB.
2.7g.
About 30 seconds after the main battery is disconnected.
Press and hold the release button for over 2 seconds.
Betaflight and Cleanflight.
The JHE20B finder and a 3-pin 1.0mm line.
| Brand | Readytosky |
|---|---|
| Dimensions | 22 x 12 x 9.5 mm |
| Operating Voltage | 5V |
| Sound Level | about 100 dB |
| Weight | 2.700000 g |
| Selling unit | PCS |
