Integrated circuit provides optimal levels receiving and transmitting & controlled side tone without excessive drawing voice network current Cable with sheathed base fabric equipped with strain relief, modular RJ11 x Plug, two 5 test clips, paddle and cable connector Light and durable. Conversation / Ring monitor switch High impedance monitor does not disturb data, conversations or signature 10 Memory storage number with 3V lithium battery (cr 2023) Walker per line clarity test Set