1. Compact design, blue backlight, big lcd screen display 2. With 10 seconds voice record function 3. Can preset set 7 group phone numbers, 6 group for Autodialing, one group for sms Least 48 hours 12. Time delay to arm/alarm 13. Voice instruction 14. Leave-ground alarm function 15. 100 historical alarm records 16. Support 5 wireless doorbells 17. Separately arm/disarm each defense zone 18. Low power consumption 19. Built in siren with 120db 20. Ring times setting function(0-9times optional) 21. Can be set to arm/disarm at specific time Power supply: input ac 110v; 220v; 230-240v; Output dc 9v, 500ma