Connection method: Bluetooth connection Extended storage: 8GB Effective distance: 10 meters Operation mode: button Housing Material: Plastic L size: size 130*100*130mm, function: Bluetooth/plug-in card/audio input/plug-in U disk, support: mobile phone/desktop/laptop/tablet S size: size 65* 80*90mm, function: Bluetooth/card, support: mobile phone/tablet, can be carried with a lanyard CREATIVE DESIGN: Unique, innovative, excellent skulI with sunglasses design, perfectly portable fits easily into backpacks or computer bags. Easy to switch the numbers and volume control and take the call. Also good as a home decoration. PERFECT SOUND: With powerful stereo speaker, HD sound quality, and strong bass. Also listen to Audible, podcasts, radio stations, or pair with Fire TV to control movies and entertainment with your voice. LONG BATTERY LIFErFAST CHARGING: Built-in 4000mah battery, lasts up to 5 hours of music playing time with a full charge, charging only 2-3 hours, very durable Constructed with high-quality materials to keep you charging, again and again, universal micro USB charging port design. UNIVERSAL COMPATIBILITY: Compatible with all Bluetooth devices. Coverage range within 15 meters, Connect your devices in just 3 seconds.