Allows communication between 2 devices * Provides sales people with a cost effective method of conducting on-site demos * Telephone line simulator for trade show demos or customer site. * provides standard (2 sec on, 4 sec off) or custom 20 HZ ringing/32 V talk battery * Provides communication between virtually any 2 telecom devices including: Ringdown applications between elevator/emergency phone or phone systems IMAGE IS NOT CORRECT