Description: Product name: Electronic Metronome Product size: 140.6 x 69.3 x 44.6MM Product weight: 150G S-200: AAA battery (No. 7 battery) x 3 External TYPE-C power supply S 200S: 1300mAh lithium battery Configuration accessories: instruction manual/TYPE-C line Sound: electronic sound real human voice Beat speed: 40 208 beats per minute Timing setting: 15min 30min 45min 60min Packing list: Electronic Metronome x 1 Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. Manual measuring please allow 1~3mm error thank you.