The Steiner bluetooth adapter is for the M8x30r LRF binocular. It provides Bluetooth capability with compatible devices such as the Kestrel 5700 Elite weather meter with LINK. The adaptor transmits range data to the device to generate an accurate firing solution for the indicated distance. Waterproof up to 5m, this reliable adapter has a range of 5 meters. Its dimension are 34.5 x 26.7 x 17.2mm. Version 4.1Binoculars, Riflescopes, Battle Sights, Rings and Mounts are backed by Steiners Heritage™ Warranty. Night Vision Devices, Laser Aiming Solutions, Beacons, and Battle Lights are backed by Steiner's eOptics 2 Year Warranty Steiner M-Series Military BT Adapter for M8x30r LRF 1535 2627