Backlineverket BT-2 Battery Box
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The BT-2 is a battery power supply with built in voltmeter. Each battery has a test button that gives you the ability to measure the voltage off the 9V batteries. The output power jacks are bypassed while measuring to display the exact voltage of the batteries without load. The BT-2 automatically activates the batteries when power is applied to the DC input jack and it disconnects the batteries when power is removed to save battery life.