Wireless High Voltage Phase Detector applied to electric power lines below 500KV, high voltage switchgear (metalclad withdraw switchgear, ring main unit, etc.) or substation phase detecting, phase test, phase sequence judgment and electricity inspection, etc. 1. Phase Detection Method: Contract & Non-contact phase detection method 2. Phase Detection Voltage: 10V~500kV 3. Phase Detection Distance: 260m 4. Phase Range: 0°~360° 5. Frequency Range: 45.0Hz~65.0Hz 6. Power Supply: Host: 3.7V, 2600mAh Rechargeable lithium battery; Detector: 3.7V, 600mAh Rechargeable lithium battery