This is a high-performance replacement digital battery for the Empire DVU-SAM1, guaranteed to meet or exceed the OEM specifications of your original. The digital battery is 1.77 x 1.29 x 0.64 inches with an output of 7.4 volts. The chemistry is LI-ION at 900mAH capacity. Manufactured by Empire Scientific, model number BLI-421. 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.