??- Voltage: DC9V~18V<br />- Current: 20mA-200mA<br />- Display distance: 0.3~1.8m<br />- Ultrasonic frequency: 40KHz<br />- 2/3/4 video sensors alternative<br />- Alarm types: 1.5~1.8m bibi alarm; 0.4~1.5m voice alarm、 0~0.4m voice "stop" warning<br />- Interfaces: Sensor*4 + monitor + power supply + loudspeaker<br />- Kit complete with wirings and installation parts<br />- Comes with 4 sensors、 power adapter cable、 loudspeaker、 22.5mm drill、 monitor connection cable and English manual<br /><br />                                                                                                                                Dimensions: 4.49 in x 2.99 in x 1.18 in (11.4 cm x 7.6 cm x 3.0 cm)<br />Weight: 3.35 oz (95 g)<br /><br />