Magicfly Portable Wireless Doorbell Chime Kit 1000-feet Range 52 Melodies, No Batteries Required for Receiver(1 Push Button+1 Door Chime) Black 52 (16 chord) elegant melodies Stable Wireless transmitting 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; Super power-saving mode; Certifications: All products passed CE, FCC, RoHS approval.