ライトボーイ（減光）

The screen is finally visible under my blanket, and the clip stays secure even when I shift around. It doesn't drain the batteries too fast either, which is a relief for long sessions.

Finally can play my GameBoy in bed without waking the whole house up. The light clips on tight enough that it doesn't shift around even during intense Mario action, and it makes the screen perfectly readable in the dark. Wish I'd bought this years ago.

Finally, I can play in the dark without a lamp pointed at the screen. The little light clip is a bit fiddly to position at first, but once it's set, the glow is just right for late-night sessions.