Description: Sensitivity: 108±3db Speaker diameter: 40mm Playing time: about 4-5h Charging time: about 1h Built-in microphone: YES TF Card: Support Charging Port: Android charging Song switching: Support (short press the function key) Volume adjustment: Support (long press the function key) Answer the call/hang up the call: Support (short press the function key) Audio I/O interface:Support Key Features Description: Sensitivity: 108±3db Speaker diameter: 40mm Playing time: about 4-5h Charging time: about 1h Built-in microphone: YES TF Card: Support Charging Port: Android charging Song switching: Support (short press the function key) Volume adjustment: Support (long press the function key) Answer the call/hang up the call: Support (short press the function key) Audio I/O interface:Support What’s in the box 1 * One pair of Bluetooth headsets 1 * Charging box 1 * Charging cable 1 * User Manual