1. With microprogramming technology,digital auto remote control and performance of stabilization 2. (wireless telecommunication) 3. Independent system of controllization of doorbell including self-monitor/unlock/call 4. Auto-closure of power-supply, the power-supply auto turn into the calendar & clock window while the work is over. 5. One outside-fix doorbell can multi-connect the inside-fix doorbells ,on the contrary, the same . 6. The remote control distance is roughly 100-150m 7. Color display screen in TFT 3.2 inch 8. 2.4G launch frequency the power below 17DBM 9. pretty shape and fire-proof material outside 10 24h-auto-monitoring for your home Tech-specification 1. Video monitor :300 thousand definition of CMOS color 2 .Display Screen: 3.2£¢color LCD 3. Power supply : 18 VDC 4. One outside-fix doorbell can multi-connect 3 or 8 inside-fix doorbells 5. power consumption: consumption of standby is less than 0.3W and the most is 15W 6. resolution ratio : 640*380(color) 7. Light of Night vision : Infrared ray 8. Surrounding temperature: -20¡æ~60¡æ 9. Weight : 15kg