This totally wireless door mat alert and door chime is a multi use product the mat can be used as an alert to shopowners for people entering their premises.it can aslo be used as a bedside monitor for the elderly or children or in the home for pet owners who want to know if their pets have left the house or arrived back at the door. The wireless door chime unit is portable so can be used as a door entry system or the transmitter/bell push can be used as a personal alert in the home or pager for the elderly to signal for attention. Protects Doorways inside and Outside. Chime unit mountable or portable self standing Wireless range is maximum 30m 3 Unique Sounds available with adjustable volume-Westminster, Gong, or Door Bell. Chime Unit- 3 x AA Batteries (Not included). Bell Push - Remote Caller 1 x A23 included. Mat size 38cm x 32cm Personal Alert. Pager for the elderly. Changeable chime tone/adjustable volume setting.