Purchasing the perfect wireless charger for your phone can be surprisingly difficult. Although the spec itself seems simple: just drop your phone on a charger and use it, but when it comes to actually getting that charger that is right for your device, there are multiple options out there. While some chargers work at different speeds, some have different form factors, and some don’t include everything you need in the box. So to make things easier for you, we’ve put together a guide of what to look out for in a wireless charger for your smartphone.