The official instructions for the iOpener really need some additional info for different microwave wattages. You don't even clarify what wattage is used for 30 seconds. I've read elsewhere that the guide is written for a 1200W microwave, but even with that info we're left guessing for lower wattages, and guesswork leads to either an overheated, burst iOpener, or a damaged phone from not heating it enough before trying to open it. As things stand, technically I've invalidated the warranty if I heat it for more than the recommended 30 seconds, as I've not used it as instructed. Please update the instructions.