(1) 2.4GHz hopping and encryption, no obstacle transmission distance is up to 300m; 
(2) Infrared light of peephole can capture image in low-illumination environment; 
(3) Monitor, Unlock, Talk, 16 pieces of chord ring, adjust volume; 
(4) 3.5" TFT LCD screen; 
(5) Indoor monitor can automatically capture, store and view photo with time stamp.
(6) Both peephole and indoor monitor are charged with USB connector, both BL- 5J rechargeable Lithium batteries.
(7) Peephole supports two work modes: 1) ON 1, it save power, works for about one year. 2) ON 2, it costs more power, works for at most 5 days.
(8) One peephole support up to 4 indoor monitors simultaneously and vice versa.
(9) Wireless unlock control supports unlock with power on and power off mode.