This guide will aid in properly removing the back cover of the device. Through doing this, you will have access to the internal pieces of the device and allow in further adjustments.
Use your fingers to slide the battery case cover off in the direction of the arrows.
Remove and discard the old batteries.
Unscrew the four outer 1.0 mm screws with a Phillips-Head screwdriver.
Push down gently on the battery case cover and slide it in the direction the arrows indicate. Remove the batteries.
Unscrew the 0.6 mm screw located in the center of the battery case.
Keep 10 mm and 0.6 mm screws separate from each other for reassembly.
Remove the back cover carefully; there are many wires that connect it to the device.