Features: Support Bluetooth handsfree call function Support TF card playback function Certified by CE, FCC, BQB Equipped with 3.5mm stereo input jack Includes sleep mode for energy saving Built-in microphone Specification: Material: ABS Output: Bluetooth Input voltage: 5 V Color: Black Bluetooth version: 4.1 EDR Transmission distance: 10m Power: Charging via mini USB cable Working time: Up to 2 hours Dimensions: 12.8 x 25 x 54.9mm Frequency: 2.4GHz Package Included: 1 x Bluetooth music receiver Operation Guide: 1. Toggle the power switch; flashing blue and red indicator lights indicate the device is ready to pair. 2. Connect the Bluetooth receiver to the speaker using a 3.5mm audio cable. 3. Open Bluetooth settings on your smartphone, search for "HQX6", and select it to start pairing. Once successfully paired, the indicator light will remain steadily lit in blue. 4. The HQX6 Bluetooth receiver will automatically reconnect to the last paired device upon next use. 5. For optimal audio quality, set your smart device to maximum volume. 6. A blinking red indicator light indicates low battery. Charge the device using a 5V/1A power source. The red light will turn off when fully charged.