Applied to electric power lines below 500KV, high voltage switchgear (metalclad withdraw switchgear, ring main unit, etc.) or substation remote phase detecting, phase test, phase sequence judgment and electricity inspection, etc. 1. Model : ETCR1500B 2. Phase Detection Voltage : AC10V~500kV 3. Satellite Phase Detecting Distance : 500km 4. Normal Phase Detecting Distance : 260m 5. Voice Prompt : "X signal is normal, Y signal is normal, same phase, out phase". 6. Power Supply : Host:3.7V, 2600mAh Rechargeable lithium battery;Detector:3.7V, 600mAh Rechargeable lithium battery