Lower voltage alarm for the li-battery to ensure timely return (Alarm voltage adjustable,also have 50 meters auditory ,usually can use for 7.4v battery )

How To install it ?

1). Just use a line to tie it on the helicopter body ,then can use
2). also when you connect it ,you must according the picture from our website .use white plug connect to the alarm ,when you first connect it ,will hear a "didi alarm" Sound.
3). also this alarm can adjust the voltage ,you can adjust the voltage by the instruction on the alarm (instruction is on the back side of the alarm)

For example ,this is an installation example for the MJX F49 helicopter.

For example2 ,this is an installation on the other helicopter . You just need to find a place ,then use a line to fasten it on the helicopter body ,or side place ,or bottom place ,they are all just ok..

Also very important ,usually the battery has two plug for 7.4v battery ,the white plug is the charge plug ,you can put it on the alarm like this picture ,when connect it ,will hear a ""bibi" sound.

Now give you an example to install the alarm on the helicopter .And you can use this case as a reference, install it on your own other brands of aircraft.