8in Drum Metronome Digital LCD Analog Electronic Percussion Beat Rhythm Trainer with USB Cable Item Type: Drum Metronome Size: Approx. 8in Material: Environmentally friendly silicone + ABS Power Supply Type: 2 x AAA battery(included) or 5V regulated DC power supply Battery Capacity: 700mAh Rhythm Type: 7 kinds Time Value: 0,1,2,3,4,5,6,7,8,9 Percussion Speed Measurement And Counting Function: Set time adjustable range 5-99 seconds Speed range: 30-280bpm How e: 1. Install the battery 2. Power Button: Press and hold the power button for 2 seconds to turn on or off. In metronome mode, tap the change button to pause or start the metronome; in tap mode, tap the change button to immediately switch to the metronome function with an operation prompt sound; in count mode, tap the change button to reset immediately Go to the last set time and start again. 3. Button Mode: In Any Mode Of Booting, Lightly Pressing The Change Button will switch to three function modes: Metronome, Tap tap, Tap tachometer count (count). 4. Button Beat: In Metronome mode, tap the Beat button to change the Beat value and save it as a predetermined value; in Tap mode, tap the change button to change the Beat value and save it as a preset value; in Count mode, Tap the Beat button to switch whether the drumhead is sounded at the same time; and there will be notes displayed on the LCD. 5. Key Tempo: In Metronome mode, tapping the two keys will change the Tempo value; in Tap mode, tapping the two keys will be invalid; in Count mode, tapping the two keys will change the value of Tempo. The set tap time is saved as a preset value. 6. Key Rhythm: In Metronome mode, tapping this key will change the Rhythm type; in Tap mode, tapping this key will change the Rhythm type and save it as a preset type; in Count mode, tapping this key will be invalid .