This is a brand new Light Proximity Sensor Replacement for iPhone 4s 4GS. Replacement part for a faulty or malfunctioning motion sensor. If you suffer from making a call and you put the phone to your ear and the screen doesn"t go black causing you to press button such as "Mute" or "Keypad" then a new proximity sensor motion sensor is what you need. This item fits iPhone 4S only. Please Note: Opening your mobile device will void your Warranty; BisLinks® cannot be held responsible for any damage occurring during your repair process. Please feel free to contact our team for further information