3.Output amplitude: 4.2V V-PP to 11.4V V-PP ( Different input voltage, the output amplitude will be different 1.Main chip: N5555; Input voltage: DC5-15V; Output amplitude: 4.2V V-PP ( 5v input) to 11.4V V-PP ( 12V input); Output frequency 1Hz-50Hz, 50Hz-1KHz, 1KHz-10KHz, 10KHz-200KHz Four Optional 4.Maximum output current 15MA, included 15MA ( 5V power supply, V-PP greater than 50%), >=35MA ( 12V power supply, V-PP greater than 50%) Output with LED indication ( low, LED will on; high, LED will off; low frequency, the LED flashes 5.The output duty cycle can fine-tune Duty cycle and frequency is not separately adjustable, adjusting the duty cycle will change the frequency 2.When power supply is 5V, the output current can be 15MA around; when 12V power supply, the output current can 35MA around