... Absorb the advantages of both domestic and foreign low frequency and intermediate frequency .3: According to different disorders with various specific ... 4, Continuous working time ≥4hr 5, Output current 0~90mA 6, Frequency of operation 500Hz,2000Hz,3000Hz,4000Hz,5000Hz,6000Hz 7 ... temperature 5°C~40 °C 14, ambient humidity ≤ 80% 15, Atmospheric pressure 860hpa~1060hpa 16, Fuse diameter=5mm*20mm,2 ...