Receiver is blocked by walls or the noise is too loud, the transmission distance is about 40ft).you can plug type-c into the receiver through to power the phone. If the phone is out of power during the live broadcast. Compatible with iPhone/iPad with lightning connectors The wireless lavalier mic for iphone can work with iPhone 7, 7 Plus, 8, 8 Plus, X, XR, XS, XS Max, 11, 11 Pro, 11 Pro Max.12/13 Pro,and iPad 2/3/4, iPad Air series, iPad Pro series(NOTE: 12.9 inch and 11 inch iPad Pro with type-c port not supported).