Feature：
* Adopt standard universal plastic bottom box
* Volume control and audio source selection.
* Work with T-4120UC series.
* Adopt dip switch to select the corresponding control channel.
* Built-in power indicator.
Specification：
| Model | T-651 |
| Communication Method | RS-485 |
| Power Supply | DC 24V |
| Signal Output | 0~100V |
| Control | Volume control |
| Channel selection | A—INPUT2, B—INPUT3, C—INPUT4, D—LINE1, E—LINE2, F—Multimedia (MP3) |
| Panel Color | Champagne gold |
| Optional Bottom Case | 77x77x48mm |
| Size | 86x86x46mm |
| Weight | 0.2Kg |
| Accessory | M4x18 screws …… 2 |
