Wide communication distance between the receiver and the infrared PIR sensor: up to 150 m (NO OBSTACLES) with a sensor-monitored area of approximately 3 to 7 m 3 switches on the receiver: The sound switch allows you to choose between sound or silent mode. The music switch lets you select from 38 different ringtones. The volume switch allows you to adjust the volume: high, medium, low, and mute. Sensor operation Power supply: 3 x 1.5V AAA batteries (not included) Receiver operation: Power supply: European plug. Receiver voltage: 110 V-240 V, 50/60 Hz. Alarm kit suitable for garages, warehouses, homes, offices, apartments, factories, hotels, etc.