Easy to Use: Headphone adapter cable connects from both USB ports to an RJ9 jack. The RJ9 jack connects to the headphones, and the USB jack connects to the computer. Comes with a Microphone Control Box: LCD digital cycle timer switch for muting the microphone, adjusting volume, and turning off the speaker with just a touch of a button. Working Status Indicator: The green standby indicator on the timer switch of the LCD digital cycle timer programmer is always on; the green call indicator flashes, and the sound is off and flashes red. Unique Design: LCD digital cycle timer switch. Lightweight, elegant, and compact design maximizes convenience and ease of use. Flexible and Practical: 158cm short cable, modular clock, LCD digital timer for easy adapter movement, while effectively protecting the USB computer interface. LCD Display - Weekly programmable electronic relay timer - 16 ON and OFF modes (AC 220V). Advanced presets up to a week in advance. Digital electronic timer for general use with daily and weekly programs. Repeat programs with 16 on/off settings. Setting accuracy to the minute. The LCD display shows real-time hours/minutes and on/auto/off. DIN rail mounting without a DIN rail. Dimensions: 86 x 36 x 65 mm. Contents: 1 timer, 1 English user manual.