You can charge the 20S by connecting the supplied USB power & data cable into a computer USB port or USB wall charger. You can use any standard micro-USB cable to charge the 20S . The LED turns red while the headset is charging and turns blue when it is fully charged. It takes about 2.5 hours to be completely charged.
Any 3rd party USB charger can be used with Sena products if the charger is approved by either the FCC, CE, IC or other locally approved agencies that Sena accepts.
Please make sure to take off your 20S -installed helmet while charging. The headset automatically turns off during charging.