TALK/RING/MONITOR switch conveniently located inside handgripSwitchable tone or pulse dialing, with switch located inside of handgripHigh impedance monitor will not disturb data, conversations, or signalingPolarity indicator Last number redial (31 digits maximum) 10 number memory storage Three position volume control for up to 12 dB gain Protection against excessive voltage and transient ringer signalsDirect connection to most batteries and power suppliesSpring-loaded reversible belt clipCloth-covered cord equipped with securely anchored strain relief, modular RJ11X plug, and two five-way test clipsSpade connector included Moisture resistant 2.5 mm headset jack compatible