This is High quality Power button + Proximity Sensor For iPhone 4 (CDMA).
It can be used to replace the broken one which could not on/off the screen.
This replacement part coming with a mute button fastening bracket.
Replace the on/off Power Button and Proximity Sensor for iPhone 4 (CDMA) is not difficult but need to be very careful.
Compatible with iPhone 4 (CDMA).