Portable Pocket Vibration Transmitted Full Body Watch Bluetooth Compatible Metronome Smart Multifunction Digital Watch Piano Guitar Chords Trainer Practice ToolsFeature:Latest design wrist metronome, portable design, smart Internet, built-in drum mode. Vibration rhythm, light cue, sound cue, can combine multiple metronomes, set band mode, light and persistence. The ultra-long range can last up to 25 days and still vibrate for 3 hours. Same spaceship engine, strong vibration, quieter, do not disturb others, slow rhythm, support Bluetooth compatible link, suitable for a variety of musical instruments. Specification:Name: metronome watchColor: BlackMaterial: Silicone + Metal Battery: built-in 200mAh lithium battery Size: Strap Length: 27cm/10.63in, Strap Width: 2.3cm/0.91in, Dial Diameter: 4.7cm/1.85in, Dial Thickness: 1.6cm/0.63inSpeed Range: 40-240bpmBeat: 0-9Rhythm: 6 Kinds of RhythmNet Weight: 47gNote:Not waterproof, do not let it get into the water. Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Thank you!Please allow 1-2cm measurement deviation due to manual measurement.1 X Metronome1 X Charging Cable1 X User Manual