Power bank current limit, use 1A plug is fine.
Or just reboot it.
Long press the power button do not let go (some are press the multi-function key), until the green light quickly flashes, this time to open Bluetooth to search for the Bluetooth headset device name, click on the pair.
Beats Solo3 Wireless flushing method:
Powered by an energy-efficient Apple W1 chip, Beats Solo3 Wireless gives you up to 40 hours of battery life. With Fast Fuel technology, fast charging in 5 minutes provides 3 hours of playback time, allowing you to quickly get back to your rhythm. The controls integrated into the earmups work with the dual-beamforming microphone to make it easy to take calls, play music, adjust volume and activate Siri on the move.
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Charge it first. If it still can't be turned on after charging, then there may be a problem with the headset, take it to repair it.