Connections : Phone jack (3.5mm stereo mini jack)
Speaker : Dynamic speaker (φ36mm)
Power supply : Four AAA batteries
BatteryLife Approx. : 120 hours (120 tempo, 4 beats, mechanical metronome, maximum volume, using standard alkaline batteries)
Dimensions : (W x D x H)60 mm x 73 mm x 113 mm / 2.36" x 2.87" x 4.45"
Weight : 167g / 0.37 lbs. (including batteries)
Included Items : four AAA alkaline batteries for verifying operation.