100% cotton T-shirt
LED panel size: 117*36*4 mm
20mm character height  
High bright SMD type LED
108(L)x20(H)mm active area
The PCB is removable and programmable.
On board programming
Acrylic front panel covers LED
The mechanics of PCB is covered, not expose directly to human body.
Contain two CR2032 batteries as power.  

Easy programmable with your own custom messages  
Stores up to 6 different messages, max. 255 characters per message  
It can display number 0-9, letter A-Z and 23signs.
3 levels of moving speeds available  
4 different kind of modes  
No battery is required to retain memory