Mechanical Metronome Sleep Aid Mini Portable

【NO BATTERY NEEDED】GLEAM mechanical metronome can be used for 12 to 45 minutes at different BPM（40- 208bpm）. No battery is needed, powered by a spring.

【40-50 BPM FOR SLEEP AID】If you have a sleep problem you'd better try this setting at 40-50 bpm.

【LIGHT AND PORTABLE】The product is small in size and light in weight, and can be put into the pocket of clothes. Suitable for carrying out.

【SUITABLE FOR ALL INSTRUMENTS】Whether you are studying piano, guitar or wind instrument, you need a metronome when training rhythm.

【NO BELL】This metronome can only be used for training rhythm sense, and the beat speed can be adjusted between 40-208bpm. No ring tone adjustment, please note.