Receive frequency: 6 options：640Hz、1.28KHz、2.56KHz、3.84KHz，6.50KHz，8.05KHz. Frequency: 6 Adjustable：640Hz、1.28KHz、2.56KHz、3.84KHz，6.50KHz，8.05KHz. Live identification: the coil can detect the pulse signal with circuit resistance 0 Ω ~500 Ω; when the test circuit resistance is 500 Ω, the cable length can reach 0-10 km.
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