Mfg. Teltone M-949

Size: 1-1/8" X 3/8" X 3/8"

Coil Resistance: 20 ohms

Contact Current: 500mA

When connected to the voice telephone lines it closes when the phone
is picked up. This can be used to control monitoring (recording) of
phone lines.

Senses telephone line current from 18-126mA.

Achieves 63dB min longitudinal balance.
1500 VDC coil to contact isolation

RFI shielding