Revex Specific Low Power Wireless Chime System Waterproof Push Button Call Chime Set XP710A This is a call chime that can be used for intercoms, caregiving, etc. I used it for about a week, but I didn't use it as much as I thought I would, so I'm selling it. The volume can be adjusted, and it can get quite loud. I attached it with double-sided tape, so there may be some marks left. Please check the images for the included accessories. Batteries will be removed before shipping. Requires 3 AA alkaline batteries and two CR2032 coin cell lithium batteries.