1. Lower Power and Ultra-long Standby Time 2. Wide Angle Lens - See clearly on every face at your door, never to be afraid to open the door. 3. IR Night Vision - Day or night, it allows you to take photography and record videos at any time. 4. Two-Way Audio with Noise Cancelling - Allows you to talk to your visitors wherever you are. And you can watch real-time videos on cellphone. 5. Note: No battery is shipped
