BestGuarder makes efficient wireless alarms with two or five motion sensors. They fit perfectly for hunting fox and wild boar but are also great to use daytime hunting as example, Roe buck! Long transmittion range (300m) between sensors and receivers means that you can get alarms from incoming game on trails early! The alarm comes on the second when a sensor is triggered, you can choose how you get it! As a vibration, acoustic signal or in earpiece. The front of the alarm box shows whit diode which sensor that has been trigged! BestGuarder has everything one can ask for to be an effective help! BestGuarder goes via radio signal - so no cost except batteries!