... ;2, Smart outlook and portable design;3, Unlock the door by wireless control;4 ,Effective range in free field up to ... card, 12 ringing tones for option;6, Support up to 2 outdoor cameras and 4 indoor monitors;7, Strong anti-jamming ... Indoor monitor can call and intercom with each other, up to 120hours of standby time;Accessories BatteryItemRechargeable Lithium BatteryBattery Capacity 1100mahNominal ...