The Amprobe BT-5000 rechargeable battery pack provides power for the Amprobe T-5000 transmitter in the Amprobe AT-5000 and AT-5005 cable and pipe locating systems (not included). The lithium-ion (Li-ion) battery pack can be recharged for multiple uses and produces less waste than using standard non-rechargeable alkaline batteries. When completely drained, the battery pack will fully charge in 8 hours or less when seated in the receiver and connected to the Amprobe EPS-5000 power supply (not included). The battery pack weighs 1.69 lb., and it measures 5.98 x 3.3 x 2.85 inches (H x W x D). (H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; and D is depth, the horizontal distance from front to back).Pipe and cable locators, also called utility locators, find pipes, cables, and wires that are buried in the ground for determining where to excavate on a site and for locating buried fixtures in need of maintenance or replacement. Pipe and cable locators are used in electrical, plumbing, telecommunications, utility maintenance, construction, and home repair applications. They have a transmitter and a receiver and use active or passive methods of location. In active location, the transmitter induces a signal at a specific frequency either into the ground, where it"s picked up by buried utilities, or directly into a pipe, cable, or wire that is connected to the transmitter. As the signal is being transmitted into the buried utility, the receiver is passed over an area until it detects the signal and locates the buried pipe, cable, or wire. In passive location, the receiver searches for alternating current (AC) frequencies or radio waves emitted by energized cables, wires, and pipes without the need for a transmitter. Pipe transmitters, signal clamps, and grounding stakes can be used to help improve locator accuracy.Amprobe manufactures electrical testing equipment for commercial, industrial, and home use. The company was founded in 1948 and is headquartered in Everett, WA.