The Alarm.com ADC-VDBA-770BLI is a battery-less insert for the ADC-VDB770 video doorbell. It can replace the battery in mechanical and wireless chime installs. Digital chime installs require a battery. If you have a digital chime please use the Alarm.com ADC-VDBA-770BAT. All ADC-VDB770 doorbells now ship with the ADC-VDBA-770BLI pre-installed. This insert eliminates the need for a battery and heater, simplifying the doorbell's configuration while ensuring consistent performance. It is an excellent choice for users who want a hassle-free setup for their video doorbell. The ADC-VDBA-770BLI is specifically made for mechanical chime systems or installations without a chime. For digital chime setups, Alarm.com recommends the ADC-VDBA-770BAT battery replacement kit instead. Installing the ADC-VDBA-770BLI is straightforward. The insert replaces the existing battery component inside the ADC-VDB770, streamlining the process and improving the overall reliability of the doorbell. With this insert, users can enjoy continuous operation without worrying about battery-related issues, making it a dependable solution for homes or businesses. The Alarm.com ADC-VDBA-770BLI is an essential accessory for those looking to optimize their ADC-VDB770 Video Doorbell. It ensures smooth, uninterrupted operation and simplifies the maintenance of your video doorbell system.