EASY SETUP: Simply plug the mini receiver into an outlet and mount the transmitter to the wall with the included accessories; includes transmitter, receiver, rivet, battery and binding band. 200M ULTRA LONG WIRELESS RANGE: 1 plug-in receiver included; won't interfere with other equipment in your home or those of your neighbours.45 CHIMES TO CHOOSE FROM: Stereo speaker delivers rich, crisp sound; 4 adjustable volume levels with a maximum setting of 110dB; press the Next or Previous button to easily choose from 45 melodies. HIGH PERFORMANCE TRANSMITTER: Works between 14F and 113F; withstands various harsh weather conditions. MULTI-PURPOSE ELECTRONIC DOORBELL: Use it as standard security for homes and apartments to always be aware of arriving guests or as an alert and paging system in warehouses, offices and classrooms.