A Nintendo DS lite is a hand-held game system with a pressure sensitive screen. The Nintendo DS Lite also is Wi-Fi enabled so you can send data or access any other Nintendo DS wirelessly.
The R4 card works like any other Nintendo DS game card, except you can load data from your computer onto and off of the card from the 1GB MicroSD.
Loading the free program developed by Jens Andersson, "Colors", onto the R4 Card allows you and inexpensive super portable digital painting tool. 512x384 Image resolution, hard and soft circular brushes (the pressure sensitivity of the screen can be set to affect the opacity and brush size). A replay feature allows you to replay and also share in the colors gallery the entire painting process. You can also save and email the painting via the DS Lites Wi-Fi feature.