Four playback modes, comfortable Bluetooth 5.0 entertainment Simple big button with one click, be steady and be firm Built-in 3600mAh large capacity lithium battery, stronger standby time, longer continuous playing time With a portable lanyard, easy to carry anywhere Two speakers TWS join forces, IPX6 waterproof, large capacity battery Powerful bass sound quality, 360 degree powerful loud volume Specification: Model: BD18 Storage type: supporting micro SD card with capacity no more than 32g Power supply: built in 3600mAh lithium battery, DC 5V-1A USB power supply for about 4 hours Speaker unit: 2pcs 60mm external magnetic horns+2pcs 65mm low frequency radiators Output power: 20W THD1% Frequency response: 55Hz-18KHz Wireless connection: Bluetooth 5.0 USB specification: USB2.0, compatible with USB1.1 MP3 format: 8Kbps 320Kbps WMA format: 32Kbps 384Kbps WAV format: 32Kbps- 1414Kbps Support MP3, WMA, WAV, APE, FLAC formats Compatible with: Apple/Xiaomi/Huawei etc. and other phones and devices which support Bluetooth 5.0 version Package included: 1 x Wireless Bluetooth Speaker 1 x English and Chinese Manual