WALKER 51323.001 WTS-501 Line Test SetIntegrated circuit voice network provides optimum receive & transmit levels & controlled sidetone without drawing excessive current Lightweight & durable Talk ring monitor switch High impedance monitor will not disturb data, conversations or signing 10 number memory storage with 3V lithium battery (CR 2023) 3 position volume control for up to 12dB of gain Protection against excessive voltage, transient ringer signals & direct connection to most
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