Feature 1HIFI SOUND QUALITY: Portable strap wireless speaker has lossless HiFi stereo sound, the sound color is clean and full, the sound is gentle and melodious. 2SPEAKER: Strap wireless speaker has a full range loud speaker and two metal bass diaphragms on the left and right, big effect, not broken sound. 3DOUBLE DIAPHRAGM: Strap Bluetooth speaker has a metal double diaphragm, left and right double bass, the sound is more surging, the human voice is clean and clear. 4LONG BATTERY LIFE: Portable Bluetooth speaker has a built in 1000 mAh lithium battery, supports USB charging, lasting life, supports charging while using. 5PLAYBACK FORMAT: Wireless Bluetooth speaker supports a variety of playback formats, support wireless Bluetooth, memory card and U disk, multi function.Item Type: Portable Bluetooth SpeakerMaterial: Alloy, PVCProduct Battery: 1000mAh Lithium Battery (Shipped with Built in Battery)Use: Wireless Portable Strap SpeakerNote: Shipped Without Memory Card .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x BluetoothSpeaker1 x Lanyard1 x ChargingCable1 x EnglishManual