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TecMate is proud to present its O-122 low battery warning flasher: Perfect to check your battery voltage Connect it via the O-1 connector (sold separately). When the device flashes, voltage has fallen below the test level and the battery has less than 50% charge remaining. Time to recharge! Prior test: the device confirms that it is properly connected and indicates that the battery is charged by flashing 2 to 3 times. Disconnect if voltage is above the test level. The O-122 flashes when voltage drops below 12.5 V. SAE connector