Wireless Doorbell, TeckNet Twin Cordless Door Chime at 500-feet Range with 52 Chimes (1 Battery Operated Receiver & 1 Wall Plug-in Receiver) Operating range of over 500 feet. (1000 feet in open area). Remote transmitter button is rated IP33 weatherproof and acceptable for outdoor use. Includes 1 Battery Operated Push Buttons, 1 Wall Plug-in Wireless receiver and 1 weather resistant transmitter: all featuring LED indicators 52 different ring tones. Four levels of adjustable volume from 25db to 110db, Memory function for sound and chime selection Easily plug receiver into an electrical outlet (no batteries required for main receiver). CE, FCC, RoHS certified. Push button can be fixed to the doorframe with screws, or attached using double-sided adhesive tapes