| The max working current | Emitter<=10mA |
| Receiver<=30mA | |
| Signal transmission format | Multi-frequency impulse |
| Signal output electric status | 8Vp-p |
| Distance of signal transmission | >=3km |
| Volume Regulate Function | Yes |
| Earphone for noise environment | Yes |
| Sensitive | induction distance less than 20 mm, strong anti-jamming ability |
| Storage Temperature | -20 to 50C |
| Operation Temperature | -10 to 40C |
| Battery | DC 9V terrace battery |
| Battery life time | >50hrs continuous use |