This is a high-performance replacement cordless battery for the V Tech 402421, guaranteed to meet or exceed the OEM specifications of your original. The cordless battery is 2.08 x 1.67 x 0.57 inches with an output of 3.6 volts. The chemistry is NiMH at 1300mAH capacity. Manufactured by Empire Scientific, model number CPH-442. 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.