This wireless water resistant device is designed to mount on a wall. Mount one next to the bed-side table or even next to the shower in the bathroom. These permanent communicators allow for full two-way voice communication anytime an emergency occurs. These units are particularly handy if one forgets to carry their pendant with them to the bathroom in the middle of the night. They operate in standby for well over a year on 4AAA alkaline batteries...and provide over 5 hours of talk time.