Opti MATE cable O-127. Permanent power sport battery lead with integrated battery status / charge system monitor for 12.8 / 13.2V lithium batteries. Weatherproof battery lead with state of charge monitor for the 12.8 V/13.2 V Life PO4 / LFP battery in your parked performance vehicle – 24-7 battery status at a blink of an LED! Smart battery cable that measures voltage, monitors charge of a stored 12 V Lithium (LMi Fe PO4) battery & confirms if the vehicle charging system is working correctly. Features Length: 24″/60 cm Battery connector: 1/4″ (M6) / 5/16” (M8) ringlets Charge connector: 2-pin SAE, protected from dirt & liquid with rubber sealing cap & shroud Operation: 2 automatic Modes – Battery charge level monitor (single LED blink mode) & Charging system test (arrow mode) Vehicle storage: 3 LEDs display ‘full to empty’ voltage range for 12.8 V/13.2 V Lithium batteries (LFP/ Li Fe PO4/ Lithium nano Phosphate), 4th LED warns when vehicle system or connected battery charger is OVERCHARGI...