This is a high-performance replacement digital battery for the Contour HD, guaranteed to meet or exceed the OEM specifications of your original. The digital battery is 2.1 x 1.35 x 0.22 inches with an output of 3.7 volts. The chemistry is LI-ION at 1250mAH capacity. Manufactured by Empire Scientific, model number BLI-433. 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.