AudioFetch Express allows class members to listen to the instructor with background music on their personal smartphones. No loud speakers affecting neighbors. Class participants download the FREE AudioFetch app at Google Play and Itunes.WiFi is integrated into the Express so no additional WiFi is needed and the Express easily interfaces with any audio device that has audio out including virtual class players, audio mixers, etc. The FetchExpress is a single input model that makes installation just about as simple as throwing it at your audio source. At just 4.25''x2.5''x1'', the FetchExpress packs a punch with its built in WiFi and multiple input types of analog, optical, or digital coax.Support a myriad of applications in a low cost, easy-to-install, maintenance-free package:Waiting rooms: Provide a single channel of TV audio from a waiting room TV.Exercise classes: Motivate exercisers while keeping the environment free from noise by streaming microphone audio and background music.Churches: Provide assistive listening to their hard-of-hearing church members.Cost effective and super easy to install and use. Incorporates simple USB power - cable included. Post your custom message, logo or ad on the app. SpecificationsNumber of Channels: 1 (stereo) DC Power Draw: +5VDC 320mA typicalDigital Optical Input: S/PDIF signal format over fiber-optic TOSLINK cable Digital Coax Input: S/PDIF signal format over coaxial cable Input Signal Level: 0.55 Volts P-P typicalInput Impedance:75 OhmSystem Latency: 115ms typicalWireless Standard: 802.11 b/g/n