Magicfly Portable Wireless Doorbell Kit Remote Button Operating at 1000 ft Range with Over 50 Chimes, No Batteries Required for Receiver [1 Transmitter 2 Receiver], White Tunes: different ring tones, over 52 (16 chord) elegant melodies; Volume: 4 levels Volume adjustable from 25db to 110db; Stable long Wireless Range: 200 meters (300 meters at open area); Excellent materials keeps itself from getting higher temperature & interference; Easy installation; convenient; double-side stickers;long lifetime; IP33 Waterproof; It is easy to DIY; A stylish modern design in classic white; Includes 2 plugin receiver unit and 1 remote transmitter button Certifications: All products passed CE, FCC, RoHS approval.