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The JHE42B-S is a dual-mode active buzzer and drone finder module for DIY FPV racing drones and multirotor builds. Locating a crashed or lost aircraft after the battery has been disconnected is a practical need, and this module is made for it.
Unlike a standard buzzer that stops as soon as the main flight battery is disconnected, the JHE42B-S has an internal rechargeable cell that is charged automatically from the flight controller's 5V rail during normal operation. It can then keep emitting a 100dB alarm on its own.
When the main battery is disconnected or fails in flight, the module detects the power-off condition and, after a 30-second wait, starts its 100dB alarm tone and white LED without any pilot input.
Two operating modes: a standard active buzzer, and an autonomous 100dB power-loss alarm.
100dB alarm: loud enough to find a drone in grass or undergrowth.
Automatic activation: starts 30 seconds after the main battery loses power.
White LED beacon: helps in low light.
Built-in rechargeable cell: charged from the 5V flight controller rail.
Manual silence: press and hold the button for more than 2 seconds.
Wide compatibility: Betaflight, Cleanflight and iNav flight controllers.
In its normal mode the module behaves like any active buzzer: connect it to the buzzer pad and it sounds with the arming and warning tones of the flight controller. While the flight controller is powered, an internal circuit charges the small cell, and a red LED shows the charging state.
If the main power disappears, the module waits for 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 gets a full charge from the flight controller before you fly, and check that the buzzer pad output is 5V.
Finding crashed FPV racing and freestyle drones
Locating a drone in tall grass or undergrowth
Low-light recovery with the white LED
Standard buzzer duty on Betaflight, Cleanflight and iNav
DIY multirotor builds
The module runs from a 5V supply and measures 18 x 17 x 15mm and weighs 4.3g. The red LED lights while charging, goes out when the cell is full and flashes during the 30-second waiting period after power loss.
The package includes the finder and a 3-pin 1.0mm cable.
Brand: ReadytoSky
Supply voltage: 5V
Dimensions: 18 x 17 x 15mm
Weight: 4.3g
Alarm: 100dB with white LED
Activation delay: 30 seconds after power loss
Silence: hold button for more than 2 seconds
Compatibility: Betaflight, Cleanflight, iNav
1 x JHE42B-S finder
1 x 3-pin 1.0mm cable
FPV racing and freestyle pilots who want a loud, self-powered locator for crashed drones.
100dB.
Yes, an internal rechargeable cell runs it after power loss.
30 seconds after main battery power is lost.
Press and hold the button for more than 2 seconds.
Betaflight, Cleanflight and iNav.
18 x 17 x 15mm and 4.3g.
| Brand | Generic |
|---|---|
| Dimensions | 18 x 17 x 15 mm |
| Operating Voltage | 5V |
| Sound Level | 100 dB |
| Weight | 4.300000 g |
| Selling unit | PCS |
