Introduction - If you have any usage issues, please Google them yourself
Pulse button phone keypad display: design a seven display phone keypad displays, monitors should be able to correctly reflect the key figures, from low to high display forward, bit by bit display key figures, the lowest for the current display position. 2. After seven digital inputs, telephone connections, the speaker issued a " toot- toot" sound connected until the answering signal input. 3. If it has not been answered, 10 seconds, automatically hang up, clear display shows speaker to stop, until the new number input.