
Overview
The JHEMCU JHE20B Finder is a 100dB buzzer alarm with LED light for BF/CF/INAV flight controllers. It works like a traditional active buzzer when connected to the flight controller, and it can also continue beeping and lighting after main battery power is disconnected to help locate the aircraft.
Key Features
- Active buzzer function synchronized with the flight controller (buzzer interface connection).
- Power-loss alarm: when the flight controller is normally connected and the main battery is powered off, the buzzer automatically sounds after 30 seconds and the LED emits white light.
- Built-in charging behavior from the flight controller power supply when wiring is correct.
- Status indication (per provided instructions): red LED on = charging; red LED off = fully charged; red LED flashing = flight controller powered off (30-second wait time).
- Sound off: press and hold the release button for more than 2 seconds to turn off the sound.
- Compatible with BF and CF flight controllers.
Specifications
| Model | JHE20B Finder |
| Sound level | 100 dB |
| Power-loss alarm delay | 30 s |
| LED light | White (power-loss alarm); Red (charging/status indication) |
| Size | 22 x 12 x 9.5 mm |
| Weight | 2.7 g |
| Cable | 3P*1.0MM line |
For setup or wiring assistance, contact https://rcdrone.top/ or email [email protected].
What's Included
- JHE20B Finder x 1
- 3P*1.0MM line x 1
Applications
- Multirotor/FPV aircraft buzzer alarm and locator
- BF/CF/INAV flight controller builds using the buzzer interface
Details

A compact 100dB FPV finder buzzer with onboard LED and a 3-pin lead for the flight controller buzzer port.

The integrated LED and small form factor make it easy to fit into tight FPV builds while keeping the locator visible.