| Model | TF-GSM-A21 |
| State | Batch supply |
| Function introduction | GSM wireless updated content,and the zoning display,dazzle colour frame,large storage,the many kinds of fonts |
| Usage | indoor/outdoor |
| Pixel | Single colour 1600x32;1024x64; Double colour 1024x32;512x64; |
| Ports | two 08 port,four 12 ports |
| Scanning mode | support 1/16,1/8,1/4,Scan the monochrome,double color module. |
| Storage | Article 400 information can be stored,each message up to 180 Chinese characters,total can store 20000 Chinese characters |
| Word stock | 16x16,32x32,48x48 and 64x64 bitmap fonts |
| Display | rain,fountain,scroll and much more |
| Partition function | In four area independent broadcast |
| Border | Support for multiple dazzle colour frame effect,the area independent display |
| Information types | Text,dial clock,text clock |
| Brightness | Level 16 brightness,support manual move bright,according to the time of the regular support brightness |
| Screen switch | manual |
| Binding number | Can bind the phone number,filtering spam messages |
| Message | Receive a text message,programmable buzzer remind,debug |
| Test buttons | Test buttons on-board,can switch over to test mode and color test mode. |
| Electrical parameters | +5V DC(4.8V～6V),Power consumption<2.5W |
| Working temperature | -20℃～50℃ |
| Size | 65mm×100mm,Hole spacing:58mm×92mm |
