A decent Ultimate Ears Wonderboom 1 Speaker charger is a USB AC charger that supplies at least 2.1 amps at 5 volts (12 watts or more). Note that currently, Ultimate Ears does not provide a compatible USB charger with its Ultimate Ears Wonderboom 1 Speaker. So, you’ll need to buy one elsewhere. These usually cost … Continue reading Ultimate Ears Wonderboom 1 Speaker Charger