HDMI KVM Switch allows to manage 2 computers with only 1 set of HD monitor, keyboard and mouse. Plus 1 more USB port for printer, speaker, etc. Making your work and life more effective. [??? ?????? ????????] KVM Switch 2 Port includes 2-pack KVM Cables(Input) and 1-pack HDMI 2.0 Cable(Output). The 2-in-1 HDMI USB integrated KVM cable minimizes your cable mess and offers you a tidy table. Longer KVM cables are available in Yinker Store. 4K HDMI KVM Switch is a handy device supports plug and play, manually switching by PANEL BUTTON and WIRED SELECTOR. No software or power adapter is needed. Pls make sure the USB pigtail is connected to host computer for power and data transmission. HDMI USB KVM Switch supports highest 4K 3840x2160@30Hz, EDID Gain Adjustment setting. Widely compatible with Windows/Vista/XP and Mac OS, Linux. [???? ??? ???? ???] Package includes: KVM Switch x1, 4FT KVM Cable x2, 5FT HDMI Cable x1, 5FT Wired Selector x1, User Manual x1. Yinker Official provide lifetime tech support.