Details: Upgrade to BT version V5.3 Complete Operational frequency range: 2400–2480 MHz Maximum power output: 4±1dBm (EIRP) BT Range: 10m in an open, barrier-free setting Range of frequency response: 20 Hz–20 kHz About six hours of music at 70% volume Call Time: approximately 4 hours at 70% volume 30mAh is the earbud battery's capacity. Case charging time for earbuds: approximately 1.5 hours Approximate charging time: 1.5 hours Approximately 3.5 cycles Input power for the case: 5V/1A