3 No collection , only sent by post , free deliver with in 1 to 3 days USB extension cable to solve the problem of desktop users plug everything in the desktop Support multi-device connection Charging the phone can be extended to support connection U disk, keyboard, mouse, card readers, printers, cameras, mobile hard disk to extend the use of computers. With magnetic ring,magnetic ring is the role of anti-electromagnetic interference to reduce the transmission loss. Feature: High purity nickel plug, reduce data loss, error signal; USB female all-inclusive design, anti-oxidation, anti-interference, multi-layer shielding; Plug used 24 hours salt spray test (nickel), improve product anti-salt spray corrosion resistance, increase product life; Wire core conductor with high quality oxygen-free copper, increase the product signal transmission surface, extend product life; Support multi-operating system, compatibility: Windows8 / 7/10 / Vista / XP / 2008/2003/2000/98 / Mac / Linux