The TM-500 not only works in handset mode, but can be used with the headset (included) for easy hands-free operation. The TM-500 is safe to operate with over-voltage and current detection.
TM-500 offers the convenience of line powered (no battery needed) operation and useful features like high impedance monitor that is data and DSL safe, polarity test, speed dial, last number dialed and pulse dialing making a technician more productive
