This is a high-performance replacement cordless battery for the ATT 22251X, guaranteed to meet or exceed the OEM specifications of your original. The cordless battery is 2.1 x 1.69 x 0.62 inches with an output of 3.6 volts. The chemistry is NiMH at 1200mAH capacity. Manufactured by Empire Scientific, model number CPH-483. We offer a 1 Year Warranty with purchase. See this product elsewhere at a lower price? Call or email us; we have a Price Match Guarantee.