Jeron has a system to fit any facility with a communication need. The Spectrum® is an excellent choice for doors, dock areas, and storage rooms-any location where limited call selection is required. The door control feature allows you to remotely control access. The Spectrum offers group call and all call capability, so you can communicate with a select group or contact an entire facility. The Spectrum Single and Dual Call Sub-Stations provide single button call capability with efficient, hands-free duplex two-way voice communications.