feature:BLE 5.0 protocol, 10m wireless transmission distance, fast transmission speed and low power consumption.Wireless Bluetooth compatible speaker, one-key hands-free answering, compact and portable, easy to use.Large-capacity 400mAh lithium-ion battery, long service life, support U disk, TF card, auxiliary output.Made of high quality ABS and electronic components material, durable.360 degree surround high fidelity sound, 3W speakers, perfect for home, office and more.Specification:Material: ABS, electronic componentsOutput power: 3WChannels: 2 channelsPower supply: built-in lithium batteryBattery capacity: 3.7V 400mAhFrequency Response: 50Hz-20KHzTransmission distance: 10mInterface type: USBBLE version: BT 5.0Charging time: 2-3 hoursWorking time: about 2 hoursExpandable storage: U disk, TF card, auxiliary outputnotes:Please allow 1-2cm error due to manual measurement, please make sure you don't mind.Due to differences between different monitors, the pictures may not reflect the actual color of the item.The package includes:1 Piece Retro Speaker