Details Function - Applicable equipment - Bluetooth 2.1 or above mobile phones; Pad; laptops1. Bluetooth function - Turn the switch to the location with the Bluetooth logo; activate Bluetooth on the device; click on the connection; you can play it.2. Wired playbackEach speaker is equipped with a charging cable that can be used on the phone3. Answer the callAfter the audio and mobile phone Bluetooth match; when the mobile phone calls; press the answer button to answer the call.4. Support TF cardYou can store songs on the TF card and play them in the TF card slot.5. High quality batteryWe use a polymer battery; which is safe and has a long life. It can be played continuously for 2 hours when the battery is fully charged.6. Volume adjustableThe volume can be adjusted on the phone; or you can long press the audio plus or minus button to increase or decrease the volume. Light press the plus or minus button to select thesong.Specification - Product features - Bluetooth; TF card; FM; USBBluet