sensitivity
10 inches (U.S.coin ), 15 inches (U.S.coin ), 20 inches (U.S.coin ), 25 inches (U.S.coin ), 30 inches (U.S.coin ), 8 inches (U.S.coin ), 18 inches (U.S.coin ), 12 inches (U.S.coin ), 40 inches (U.S.coin ), 50 inches (U.S.coin )
operating frequency
30 KHz, 7 KHz, 24 khz, 25 kHz, 20 Khz, 21 kHz, 10 KHZ, 19 KHz, 50 KHZ, 27 KHz, 17 kHz, Multi-frequency, 4 kHz, 22 kHz, 40 kHz, 3 KHz, 14 kHz, 16 KHz, 29 kHz
