This is a high-performance replacement remote control battery for the Sonos CONTROLLER CR100, guaranteed to meet or exceed the OEM specifications of your original. The remote control battery is 5.35 x 1.71 x 0.205 inches with an output of 3.7 volts. The chemistry is LI-POL at 3600mAH capacity. Manufactured by Empire Scientific, model number RLP-020-3.6. 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.