Important: After connecting the computers and the monitors through KVM, you need to set the screen output mode on the computer (press Windows+P) and select the output mode in the pop-up window on the screen. Package includes 1 x USB 3.0 Displayport HDMI dual monitor KVM switch, 1 x Power adapter, 1 x Wired Remote Switch, 4 x USB 3.0 Type-A to B cable, and 1 x User Manual. We offer a 2-year warranty. We offer a 2-year warranty. 2 Switching modes and Wide Compatibility: 1.Toggle selection on front panel 2. Wired remote switch. Compatible with a variety of computer systems, such as Windows, Linux, Mac, Unix, Ubuntu, Raspberry and most other major OS; also supports DP/HDMI devices without USB signal input like DVR, NVR etc. LED indicate the active computer. 3 USB 3.0 and Audio Microphone Ports: This dual monitor KVM HDMI switcher with 3 USB 3.0 ports which can recognize keyboard mouse, U-disk, printer, or other USB devices. USB 3.0 has a faster data transfer speed of up to 5Gbps, backward compatible with USB 2.0/1.1 devices while USB 2.0 has a data transfer speed of 480Mbps. Come with a 3.5mm Audio Jack port with a DAC chip inside and a 3.5mm microphone interface, which can be inserted into a 3-segment 3.5mm earpiece device and microphone. Dual Monitor KVM Switch Ultra HD 4K@60Hz: This dual monitor 4 port kvm switch supporting high resolution max up to 4K@60Hz, and also supports 3D and 1080P@60Hz or other lower resolution (Downward Compatible). Support up to 4K@60Hz for extended and mirrored display. Note: Only when both your computer Graphics card, monitor and DP/HDMI cable support 4K@60Hz then you can get 4K@60Hz effect, so if you want the max resolution you have to check your devices first. 4 Port USB 3.0 DisplayPort HDMI Dual Monitor KVM Switch: This DisplayPort HDMI dual monitor KVM Switch allows you to control 4 computers or laptops with one set of keyboard, mouse, and single or dual monitors to make your workspace tidy and efficient, also a premium choice for working from home. Note: This dual monitor KVM supports HDMI + DP dual-screen display (This function requires your PC to support dual display or multi-display, then you can use this KVM to achieve 4 PCs to share 2 monitors).