Below is the list of the lost aircraft buzzers-finders with built-in lipos.
HellGate FPV Buzzer w/ Built-in Lipo
HellGate buzzer was the first lost drone buzzer/finder device and started the trend for these tiny devices. It is the the smallest and the lightest of the all. Weights only 2.2g and the size is only 10x10x15mm. HellGate FPV Buzzer works authomonously for 3 days. Works as standart FC buzzer and charges the built-in backup batttery while power is connected and starts buzzing when power is lost. There is no LED and no push button for switching the buzzer off. To deactivate the buzzer simply reconnect the Lipo briefly and disconnect it after the deactivation tone.
It is also the most expensive buzzer with the price at about $25.
Available @ https://www.getfpv.com/hellgate-fpv-buzzer-w-built-in-lipo.html
Active alarm for up to 3 days
Hibernating alarm for up to 2 weeks
Tiny size and weight
FC Buzzer passthrough
Dimensions: 10x10x15 mm
Vifly Finder 2 Super Loud Buzzer Tracker Over 100dB w/ Battery
Vifly Finder 2 is the most feature rich buzzer/finder device. This finder works as standart buzzer while connected to the FC buzzer port. It also works connected straight to the receivers PWM output, so it also can be used in the aircrafts without Flight Controllers. If it senses, that main power source is disconnected or the receivers signal is lost it activates the buzzer and can work up to 30 hours with alarm on. Vifly Finder has light sensor and can adjust the LED light intensity according to the ambient light. Also it detects the night and goes to sleep state to save the power.
Price is about $14.50. You get the most feature rich buzzer for this price.
Available @ https://www.banggood.com/Vifly-Finder-5V-Super-Loud-Buzzer-Tracker-Over-100DB-Built-in-Battery-for-Flight-Controller-RC-Drone-p-1329066.html
Name: Vifly Finder 2
Item Name: 5V Buzzer for RC Drone
– Built-in Battery & LED Light
Volume: Up to 105dB
Working Time: Up to 30 Hours
Charge Time: 1.5 Hours
Battery: 80mAh Lipo
Input Voltage: 4.5-8.5V
– VIFLY Finder 2 can power itself to beep even the quad battery has been ejected.
– It built-in light sensor can detect light intensity and then smartly control the LED light to flash.
– Buzzer automatically enter into sleep mode at night to save power and not disturb.
– Much Louder than Standard Buzzer
To easily find the crashed quad in long distance, VIFLY Finder 2 is designed to install a very loud beeper that the dB is over 100.
– Two Options to Disarm the Buzzer
Option 1, Disarm with button: Disconnect main battery, hold disarm button on VIFLY Finder 2 for 1-5 seconds then release.
Option 2, Disarm with main battery: Disconnect main battery, then connect main battery for 3-6 seconds and disconnect it again.
– Compatible with Both FPV quadcopter and RC Airplane
VIFLY finder 2 is programmed to be compatible with any flight controllers to support FPV quad, and receivers for RC airplane.
No extra setting required, it will automatically recognize the device to connect.
FullSpeed Lucky Box Beeper Buzzer 90dB
FullSpeed has made one of the smallest and the lightest buzzer/lost drone finder. It’s weight is only 2.3g (just a 0.1g more than HellGate Buzzer). While it is not the loudest buzzer (sound level is about 90dB), but definitely the smallest buzzer – it’s size is 15.5×13.5mm. Works as standart buzzer and charges internal battery when powered from the main power source and starts the buzzer when the power is dissconected. Also has a bright LED that also helps to locate the lost drone.
Priced about $10.99. The best cost effective buzzer.
Available @ https://www.banggood.com/FullSpeed-Lucky-Box-Beeper-Buzzer-5V-Built-in-Battery-for-RC-Drone-FPV-Racing-p-1340935.html
Brand name: FullSpeed
Item name: Lucky Box Beeper
Input Voltage: 5V
– A Working Buzzer after Battery Ejection
Lucky Box Beeper is designed with a built-in battery that gives it the power to sound an alarm even after the quad battery was disconnected.
Lucky Box Beeper charges itself simply by being plugged in.
– Adapt to Any Flight Controllers
Lucky Box Beeper is programed to be compatible with any model flight controllers. Just connect it to FC and fly it.
LANTIAN HXZ01 110dBi Finder Buzzer Built-in Battery
Lantian HXZ01 buzzer/lost drone finder has built in battery, 110dB buzzer, small LED and a push button. This buzzer is intended to be stack mounted, it has 30x30mm ans 20x20mm mounting holes. Weight is definitely low – only 3.8 g. Works as standart buzzer while connected to the main power battery ans starts the buzzer signal automaticaly when the power source is diconnected. Also lights the white LED to help to spot the quad in the low light conditions.
Price is about $9.
Available @ https://www.banggood.com/LANTIAN-110dBi-Finder-Buzzer-Built-in-Battery-w-LED-Light-for-RC-Drone-F3-F4-F7-Flight-Controller-p-1360314.html
Brand name: LANTIAN
Item name: 110dBi Finder Buzzer
Size: 36*36mm (compatible with size flight control mounting holes)
Weight: 3.8 grams
Interface definition: black GND / Red 5V / Green BUZZER- / Yellow 5V or power
1. Compatible with the function of the traditional active buzzer, synchronized with the drive of the flight control, connected to BUZZER-
2. Power-off alarm function, after the main battery is off in flight, the HXZ01 can still automatically emit 110 dB of drip sound after 30 seconds of power-off, and the LED will emit white light, the sound is much louder than the general buzzer.
How to turn off the buzzer:
Press and hold the release button for more than 2 seconds, the HXZ01 Finder turns off the sound.
The HXZ01 Finder is compatible with all BF and CF flight controls. Just connect to the buzzer interface of the flight controller and it will work. When the flight control wiring is correct, the aircraft is powered on, and the 5V of the flight control will automatically charge the HXZ01 Finder (the red LED will light to indicate that charging is in progress).
1 x HXZ01 Finder
1 x 4P*1.0MM line
JHE42B 110DBI Finder Buzzer Built-in Battery
Pobably the biggest and the cheapest of buzzer/finder with battery. Basically it is copy of the Vifly Finder V1. It works as standart buzzer while the quadcopter battery is connected and afer 30 second from the battery disconnect it starts emmiting the 110dB signal. It also has LED that turns bright white in case of the alarm. So it has basic functions, cheap and bulky.
Price varies from $6.99 to $12.99
Available @: https://www.banggood.com/JHE42B-110DB-Finder-Buzzer-Built-in-Battery-with-LED-Light-for-RC-Drone-F3-F4-F7-Flight-Controller-p-1338216.html
Item name: JHE42B Finder Buzzer .
Weight: 7.4 g
The buzzer has two modes of operation:
1. It is compatible with the functions of the traditional active buzzer and synchronized with the flight control.
2. When the flight control is normally connected, if the main battery in the flight is powered off, it can still automatically emit 110 dB of drip sound after 30 seconds of power failure, and the LED will emit white light, and the sound is louder than the general buzzer. Much bigger.
How to turn off the buzzer:
Press and hold the release button for more than 2 seconds, the JHE42B Finder turns off the sound.
The JHE42B Finder is compatible with all BF and CF flight controls. Just connect to the buzzer interface of the flight controller and it will work. When the flight control wiring is correct, the multi-rotor aircraft is powered on, and the flight control power supply will automatically charge the JHE42B Finder (the red LED will light to indicate that charging is in progress).
1 x JHE42B Finder
1 x 3P*1.0MM line