The NT-320 kit contains a bell (receiver) and a wireless motion sensor (transmitter). The siren is used to report the appearance of a person in a specific space (e.g. entering a shop) or to warn of the appearance of unwanted people in protected areas. It is perfect for premises such as shops, hotel receptions, warehouses, offices, etc. - anywhere where service may take place in a different room from the customer. The maximum distance between transmitter and receiver is 100 m*. When motion is detected, the sensor sends a radio signal to the receiver. The receiver starts playing the selected sound or melody. The motion sensor also has a second operating mode: if it detects motion without the receiver being present, it generates an alarm sound - then it functions as a simple mini-alarm. Product features: - Radio motion sensor with the option of independent operation (independent mini-alarm function) - Receiver and transmitter with battery operation (transmitter additionally with the option of connecting a power source) - Sound level of approx. 85 dB in the receiver and 90 dB in the transmitter - an ideal device to notify people of access to a specific room at home, in shops, hotel reception, warehouses, etc. - Range 100 m outdoors* - 5-level volume control.