With a subtle sound radio entry detector when a person enters the area under surveillance. A volume control is used to set the desired volume up to 90 dBA at the receiver, or turn the sound completely, then, the receiver contains an integrated signal lamp to ensure you do not miss anything. 8 different ring tones in CD sound quality are available for selection. The monitoring range of 360° using 3 different capture limiter caps on 110° reduced in order to monitor different areas targeted. The radio receiver can be due to the integrated rechargeable battery pack (3 AA NiMH rechargeable batteries 3.7 V) can also be used on a mobile simply and comfortably. For charging the rechargeable battery of the power supply unit is then simply folded out and with a 230 V socket. The transmitter with the PIR sensor is battery-operated and it requires 2 x 1.5V AA batteries. Radio frequency 434 MHz. The set can be used optionally for a wireless door bell system be extended, see accessories.This text is