Originally Posted By: Alan D no external power needed for dvr it has built in battery last 2hrs . rigging mic I used a 9v battery. Mic is to sensitive and I need to figure how to ajust . it picks up dogs barking from blocks away but seems fuzzy when I speek Alan, 2 hours seems like a long time but when the temps get below freezing, and if the DVR has to be on, the battery goes quick. My other DVRs said they lasted for hours as well, and were dead after a few stands. I believe I read somewhere the unit has an auto-record when turned on feature. If this is the case, a user could wait until they see a coyote, power on the DVR, and hopefully it will start recording. This can save a lot of battery. Even with that, if you have a coyote hold up or you forget to turn off the recording, these small internal batteries don't last long, and it is nice to have an option for an external battery connection, which I believe this has.
For those looking for audio recording, many of the other DVRs have internal mics, so you don't have to worry about connecting an external mic.