Specifications:
1) Power: DC 9V, AC power supply, or rechargeable battery
2) Operation frequency: 25KHz
3) Working current: < 50mA
4) Working voltage: DC 9V
5) Temperature: -5 - 55oC
6) Weight: 210g
7) Dimensions (L x W x H): 390 x 65 x 30mm
8) Designed according to the body somatology theory
9) High-sensitivity, high stability
10) Sound/light alarm, optional earphone
11) Low power design