This is a high-performance replacement two-way battery for the Motorola NTN5521A, guaranteed to meet or exceed the OEM specifications of your original. The two-way battery is 3.11 x 2.63 x 1.39 inches. Manufactured by Empire Scientific, model number EPP-5521. 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.