V-Series 1RU 12 Pushbutton Panel with 4-pin XLR or 5-pin XLR Male Headset. The key-panel has 12 talk pushbutton keys and 12 listen pushbuttons including one reply/answer-back key and 8 shift pages. Each key has associated up/down audio level control buttons. The panel menu provides user set-ups and assignment options. The rear panel has Audio I/O and GPI/O connections.Key features:• International 10 character alpha-numerical fonts for ease of caller ID recognition • Yellow OLED's for better contrast and visibility• Individual key menus help ease of use and assignment• Digital Signal Processing (DSP) for audio routing and effects • “Listen Again” - replays last 30 seconds of incoming call • Each V-Series panel can be supervised or supervise another.