Features: *Indoor monitor supports real-time surveillance, visual and two-way audio intercom, remote unlock and hands-free function. *Outdoor camera features in water-proof, anti oxidation and wear resistance, equipped with rain-proof cover, it supports embedded installation and hanging garment two modes. *Outdoor unit also has automatic infrared night view function, which can provide with clear sight at night. *When someone touch the doorbell outdoor, the indoor music doorbell will ring and remind the host to open the door. *Remotely unlock functions: householders don't have to run to the door you can remotely unlock by the indoor monitor directly. *You can monitor what happened in front of your door with indoor monitor. *Volume adjustable. Come with power supply terminal wire, user can install by themselves. *Compatible with DC 12V NO/NC electric lock (not included). *About two minutes intercom duration time, after two minutes, it will turn to standby mode, it's more power-saving.