Relatively speaking, the charging treasure is more important, if there is no electricity, the Bluetooth headset is basically equal to waste, so it is more appropriate to buy a charging treasure in this way.
Mobile power supply, mobile charger (line electricity, line charge, charging treasure, urine bag, wet nurse; Power bank is a portable charger that can be carried by an individual and can store electrical energy itself, mainly for handheld mobile devices and other consumer electronic products (such as wireless phones, notebook computers) to charge, especially in the absence of external power supply. Its main components include: a battery used as energy storage, a circuit that stabilizes the output voltage (DC-DC converter), and most mobile power supplies have chargers that are used as built-in batteries for charging.
The mobile power supply originally appeared to charge consumer electronics in the absence of an external power supply, but because its output interface is a highly versatile USB interface, it is also used as a power supply for other devices or devices with USB interface as a power input, such as USBLED lamp, USB electric fan, etc.
The earphones and charging banks that buy mobile phones are basically cheap. Choose which one you need according to your situation.