Security Monitors & Recorders Differences between Model A ( 801 ) and Model B ( 812 ) None Internet or Wi-Fi Required No internet connection means the video and audio signal only transmits to ONLY ONE monitor unit. No one else can hack in. The closed-loop system provides you with a secure and private. Two-Way Voice Intercom You can talk with your baby in another room. Automatic Night Vision This feature allows you to keep an eye on your baby at night. Temperature Monitoring It can keep monitoring indoor temperature around the camera. Remote Control Pan-Tilt Camera 4.3 inch Screen Size Multiple Languages Supported Long Standby Duration in VOX Mode In VOX mode, the battery duration can be up to 24 hours. Kindly Note >>>>> There is NO battery inside of the camera , so the camera always needs to be connected with a power adapter while running. The parent unit has a battery inside. It can operate with the battery or a power adapter.