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They comes with there own adapters so you can use all the times but you can use simple normal batteries if you walking around but if unit plug in you don't have to use batteries
Brooke - The VTech DM111 is an AC powered baby monitor. If you want to move around the house with the parent unit for a few minutes, you can install two AAA alkaline batteries for backup use. Thank you, -VTech Support
Brooke - The VTech DM111 uses AAA alkaline batteries. This is an AC powered baby monitor. The unit when running on batteries, will only operate for a short time. The batteries are for back-up use and it does not recharge when the parent unit is plugged in. We recommend to have the parent unit plugged in at all times for continuous monitoring. Thank you for your interest! ~VTech Support