The case does cover the Infrared, but it doesn't stop it completely - it just diffuses it.
You'll need to be within 0.5m of the device you want to control, but then it's wireless - so usually it's not too difficult to put it within range. You can take the case off (or cut a hole) to increase range, but then the Infrared is very directional so you'll need to have the flat face of the Puck facing the device you want to control, which can be more difficult,
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
The case does cover the Infrared, but it doesn't stop it completely - it just diffuses it.
You'll need to be within 0.5m of the device you want to control, but then it's wireless - so usually it's not too difficult to put it within range. You can take the case off (or cut a hole) to increase range, but then the Infrared is very directional so you'll need to have the flat face of the Puck facing the device you want to control, which can be more difficult,