Instruct: Classify the given Amazon review into its appropriate rating category
Query: Falls apart when changing battery.

They need to redesign the handle. It DOES NOT unscrew but rather you must use brute force to separate the top from the bottom. Most of the time the top portion will come off and small parts from the switch will come spilling out, rendering the product inoperable. Very poor engineering in this regard. A simple round 'screw-on' bottom portion would be much better making battery replacement possible.