Wireless human sensor with a detection range of up to 180m, featuring 64-step volume settings. - Brand: REVEK - Model: XP750A - Maximum Detection Distance: 180m - Volume Settings: 64 steps - Wireless Method: Wireless Thank you for viewing. I purchased this for my father's care. Batteries are not included. It has been used, but it is still usable. My father's name is written on the top of the case with a marker (see photo 5).