product descriptionProduct specifications:Size 70x45x25mm  Weight 120g1. Output power: 3WTHD: 10%2. Sensitivity ratio: 360mv3, signal to noise ratio: 80 decibels4. Input power: DC5V/500 mA5. Frequency: 120HZ-20KHZ6. Bluetooth version: Bluetooth 3.0+ EDRPackage Included:1 smart watch speaker B901 USB charging cableConnection method Bluetooth connectionInterface Type Card ReaderBattery capacity 400mAFrequency response range 120HZ-20KHZOutput power 3WSignal to noise ratio ≥75dBPower supply mode Built-in lithium batteryChannel 2Play time 6 hoursExtended storage 8GBBluetooth Protocol 3.0Number of speakers 1Effective distance 10 metersFeatures Waterproof, drop-proof, voice prompt, card, radio, dustproof, call functionMode of operationApplicable peopleDisplayPlay format MP3, APE, WMA, FLC, WAVShell material plasticWhether to support APP or notSupport format TF cardSpeaker adjustment modeIs there a radio function?Box material plasticAppearance size 57.5*48.5*37Packing list Bluetooth watch speaker Data cable Instruction manualPower mode USBColor red, iron ash, sky blue, rose gold, business silver