Magic board is designed for free writing and free erasing advertising board.Even being written by hand,the writing can have hiht brightness LED board. Further,the flickering time can be set by user.you can expect"Neon Sign"effect with this Magice board,They are suitable for indoor place,such as Bars,Cafes,Club,Store,Restaurant,Super-market.Hotel,Exhibition hall,etc. You can write and erase sentence on the magic board.It's good for indoor and outdoor use by DC12V adaptor only. Lower power consumption,almost fire-free,portale,low cost & user friendly advertising board. It's easily to erase the board with soft & smooth cloth. Caution!!Pay attention not drop the water into the LED circuit.It might cause damage to the circuit.