Specifications:The music player is made of metal material, which makes it durable to use.It supports bluetooth-compatible and TF card modes which is convenient for you to listen to music wherever you are.You can take two audio true wireless stereo wireless connection to make fast connection with bluetooth-compatible 5.0 chip.It has 500mAh large capacity built-in battery, which can be used for four hours and is rechargeable.The mini compact size is easy to carry.Item Name: bluetooth-compatible SpeakerMaterial: MetalBluetooth Version: 5.0Transmission Distance: 10mBattery Capacity: 500mAh (Included)Playing Time: 2-4HCharging Time: 1HOutput Power: 3WSignal to Noise Ratio: 75dBExpansion Storage: 16GBFeatures: Wireless, Easy to Carry, Rechargeable, PortableSize: 4.4cm x 4.4cm x 4cm/1.73" x 1.73" x 1.57" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x bluetooth-compatible Speaker1 x Charging Cable1 x User Manual