... indoor phones.E-lock can be connected to both door station and indoor phone.Anti-vandal, waterproof, cast aluminium, surface mount.Night viewing ... (3.5'')/960×234(4'',5'',5.8'')/1440×234(7'') pixels Working Voltage: DC18V±10% Working Current: ≤500mA Environment ... )1 piece User's manual 1 pieceDoor station with indoor phonesVI,V22VI,V21,V23VI,V12,V18 Video door station with CE and RoHS certification