Can be used in conjunction with a BF320 vibrating pillow pad to warnthe hearing impaired of a potential fire alarm or evacuation alert condition. Compatible with all C-TEC fire alarm and evacuation alert systems. Locking mini-XLR connector and plug arrangement helps prevent accidental pillow pad removal. Line monitored for disconnection via aninternal 6k8 end of line resistor(selectable at the BF320JP). Selectable 6K8 (pillow pad) or 27K (jack socket) end of line monitoring options for fire alarm or evacuation alert system use. Can be used on systems with a 10-30V DC voltagerange Fits on a standard UK 25mm back box. Supersedes our old BF364 jack socket.