Item Type: Portable Bluetooth Speaker Material: Alloy, PVC Product Battery: 1000mAh Lithium Battery (Shipped with Built in Battery) Use: Wireless Portable Strap Speaker Note: Shipped Without Memory Card Package List 1 x Bluetooth Speaker 1 x Lanyard 1 x Charging Cable 1 x English Manual 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.