... , simple installation, no wiring3. Digital audio, clear voice4. Indoor unit monitor outside, indoor and outdoor two-way intercom5. No radiation,low power ... : 3xAAA battery, Automatic power saving mode, Battery reminder10. Dimensions: Indoor unit: 108*96*16mm, Outdoor Unit:62*40*12mm 11 ... . Package contents: 1x Indoor unit, 1x Outdoor unit, 1x Mounting plate, 1x Tightening ...