This is a high-performance replacement cordless battery for the Jabra PRO 920, guaranteed to meet or exceed the OEM specifications of your original. The cordless battery is 1.17 x 0.78 x 0.199 inches with an output of 3.7 volts. The chemistry is LI-POL at 295mAH capacity. Manufactured by Empire Scientific, model number CPP-548. 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.