1 Mhz and 3 Mhz. Output: 15 Acoustic in Continuous & 21 Acoustic in Pulse Mode. Pulse Ratio for 1 Mhz : 1:1, 1:4, 1:8, 1:10, 1:13 & 1:16. Pulse Ratio for 3 Mhz 1:1 ,1:2, 1:4, 1:6, 1:12, 1:16 & 1:20. Frequency: 1/3 MHz.
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