SIMPLE SET UP: Just plug the mini receiver into a socket and fix the transmitter on a wall with the accessories provided; includes transmitter, receiver, rivet, battery and bonding tape. 200 M ULTRA LONG WIRELESS RANGE: 1 plug-in receiver included; will not interfere with other equipment in your home or those of your neighbors. 45 CHIMES TO CHOOSE FROM: Stereo speaker delivers rich and crisp sound; 4 adjustable volume levels with a maximum setting of 110 dB; press Next or Previous button to easily choose from 45 melodies. HIGH PERFORMANCE TRANSMITTER: Works between 14F to 113F; withstands various harsh weather conditions. MULTI-PURPOSE ELECTRONIC DOORBELL: Use as standard security for homes and apartments to always be aware of arriving guests or as an alert and paging system in warehouse, office, and classroom settings.