Provides a cost-effective, easy-to-use method of conducting preliminary checks on most telecommunication devices. Compatible with modems, FAX machines, answering machines, or feature phones. With two-way call capability, either line can call the other simply by going “off-hook”. Ringback signal is provided to the caller, interrupted ring voltage is applied to the station called. A one-pair talk path and talk battery is provided to complete the simulation. 115 VAC. 1-1/2 x 4-1/4 x 3-1/4”, 1 lb. 1-year warranty.