Features 1. Aluminum alloy panel of indoor unit, fashionable and luxury. 2. Water & oxidation-proof, durable aluminum alloy made outdoor station 3. Water & oxidation-proof, durable aluminum alloy made outdoor station 4. The camera could be high definition 5. monitor, intercom, unlock, wireless control, code unlock., hand free, monitors talks to monitor 6. support 500 ID cards 7. Wireless unlocks distance: 5-10m. 8. Suitable most of the electronics lock, with delay unlocks functions. 9. Volume, brightness & contrast adjustable. 10. easy to install 11. Can be 1&1, 2&1, 1&2, 1&3 systems.