Swissdigital Bolligen Black Sleeve for 16-in Computers Screen Size__27" the SELP18105G lens features two

the SELP18105G lens features two ED glass elements and three aspherical elements for high resolution and contrast throughout the entire zoom range

A special power bank is not required

with up to 20 hours of continuous use on a full charge

Four 3” titanium vapor deposit cone woofers with ribbed surrounds

Swissdigital Bolligen Black Sleeve for 16-in Computers Screen Size__27" the SELP18105G lens features twoBolligen sleeve is a black sleeve. No need to take out laptop from sleeve, the adjustable design allows the sleeve can fit any laptop up to Macbook Pro 14" INTEGRATED USB CHARGING PORT: Equipped with a USB charging port, offering quick access to charge your phone and other electronic devices like smart phone, tablet, kindle, and all other USB devices on the go while using them at the same time. A power bank is not included. A special power bank is not