FK326

It will also provide a low line-load connection where telephone call interception is required.
In situations where telephone signal is poor the FK302 two-way amplifier boosts the sound level so that parallel hand sets can be accommodated. An 8Ohm 0.25W speaker is included in the kit. 

Technical Specification

• Power Supply : 4.5-9VDC (160mA max. @ 9VDC)
• Signal Level Adjustment : Trimmer potentiometer.
• PCB Dimensions : 2.21" x 1.37" x 0.6" (56.13mm x 37.8mm x 15mm)
• Recommended Housing : FB03