When the battery is low, you will hear mid-tone triple beeps and a voice prompt, “Low Battery”. You can charge the Snowtalk 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 Snowtalk. The charging LED is red while charging, and turns to blue when the headset is fully charged. It takes about 2.5 hours to be completely charged.