A given gadget’s product description will normally specify if it’s only compatible with certain devices. If you only see that the gadget is “Bluetooth enabled," a "Bluetooth device," or some variation of that phrasing, it means it can wirelessly connect to any other Bluetooth-enabled device. If a gadget requires Bluetooth connection to work, you want to make sure the person you’re shopping for has a Bluetooth-enabled device. For instance, you don’t want to buy a gadget that requires mobile app use for someone who doesn’t have a smartphone.