Gameboy Pocket [Yellow] order & Tetris DX game

Product Name: Gameboy Pocket [Yellow] order & Tetris DX game
Vintage Gameboy Pocket yellow [1989 - 1996] used & Tetris DX game. I got it from a friend years ago who didn't have the back panel for the batteries but it still works fine as you can see from the first photo. Also if you don't like it exposed you can put some tape on there but I've never done that and the batteries stay in place even after all these years. There's a volume order toggle wheel, a headphone jack, a contrast toggle wheel, and EXT.