If the video suddenly looks dark while you’re taking an eardrum recording, stop and slowly remove the device from the ear. Check to make sure the light is turned on. You can do this by pointing it toward your hand and looking for a small circle of light. If the light does not work, change the battery by following the directions in the Instructions for Use. Ensure your phone screen brightness is turned all the way up. Check  your  camera lens to see if it’s  clean. Make sure your SmartCheck lens is clean. If the lens is dirty, follow the cleaning instructions in the Instructions for Use. Your SmartCheck device may not be in the correct position to line up with your phone’s main camera. To change between the phone clamp’s 2 positions, press or pull firmly on the device body until you hear it click into place. Please see the FAQ on this topic for more information on how to adjust the position of your SmartCheck device. Confirm that your SmartCheck device is properly aligned over your phone’s main camera.