you Need to configure the Battery by yourself：
Battery 12 v DC 20AH-36AH
Battery > 20 Ah (About 1 to 2 hours)
Package Included: 1x SU-835 MP
Utrasonic Inverter (battery is not included)
Input Voltage 12 VDC Nominal Range (10-14 VDC)
Input Current 5-50 Amps (operating 10-30 Amps)
Output Voltage 1000 V Max (550v-inverter and doubled in impulse to 1000v max)
Output Power: 600 watts maximum (in peak) (operating 100-400 watts)
Output Frequency (5-100) Hz in 1 Hz steps,output duration (30 microseconds – 2.5 milliseconds)
ZGUO 835MP Ultrasonic Inverter,Electro Fisher, Fishing Machine Fish Stunner New 12v
