The RemoteMix 4 from JK Audio is a 4-channel field mixer, headphone amplifier, and communications interface, packed into a rugged enclosure that's smaller than a lunchbox. Designed to work together in the field with minimal setup, the components of the RemoteMix 4 are ideal for radio, television, or filmmaking. The unit features a phone line hybrid and keypad, as well as a PBX handset interface, and a cell phone interface, providing terrific phone options for radio call-ins or live remotes. Four IFB feeds allow you to send and receive interview audio, as well as pull IFB from a business or cell phone. The RemoteMix 4 first tries to connect to cell phones via Bluetooth wireless technology. If a connection can't be made, a 2.5mm jack allows a hard-wired connection. Other connectors include 4 XLR inputs with phantom power, an XLR line output, 4 1/4" headphone jacks, a 1/4" line input, and 3.5mm send and receive jacks.