Features:1. With ringer on/off adjustment function.2. With audio / pulse conversion function.3. With redial and hang up function.4. It is designed with the most advanced micro-processing chip and premium electronic circuit, which ensures the reliability of the machine is fully guaranteed.5. The appearance is novel, beautiful and generous.Specification:Model: 1002Plug: RJ45 and alligator clipColor: White, Red(optional)Recording function: NoCaller ID: NoVisual function: NoNumber storage function: NoTouch screen: NoScope of application: engineering testPackage List:1 * Telephone Line Tester1 * Test Line1 * Chinese ManualInstructions for use:1. Answer the call:The outside line calls the local machine to ring, pull the phone open, you can talk to the other party, the call is completed, close the phone, resume the on-hook state, so as to avoid long-term busy line to prevent outside calls.2. Make a call:Open the phone, dial the dial tone, you can dial the number, and hear the ringback tone, indicating that the called party's phone has ringed, waiting for the other party to answer, and the call is closed.3. Redraw and hang up function:When the dialed phone number is busy, you can close the phone, and then open the phone later. Press the "Re-draw" button to automatically dial the phone number that was originally dialed. You can also redial the previous number by pressing the "Hang Up|" button and then pressing the "Redial" button when you hear the busy tone.4. Ringtone on/off:This unit is equipped with a ringer switch, which can be set to "ON" or "OFF" according to individual needs.5. Audio pulse system conversion:This unit is equipped with an audio pulse system switch, which can be placed in the position of "T" (audio) or "P" (pulse) according to individual needs..