3mm Unifying receiver 6mm Unifying receiver Their functions are almost the same, but the size is different. Item Features/Specifications: It lets you connect up to six compatible mice and keyboards to one receiver Download Unifying software to quickly add all of your devices to one receiver. NOTE: This unifying receiver is only compatible with Logitech mouse and keyboard that have a unifying logo. Please make sure that your mouse or keyboard have unifying logo. NOT compatible to 3.0 USP Port The logo at the bottom of the receiver is not the same because of the different production batches, will be sent Randomly . Compatible Mouse: M186、M215(Unifying Version,with Unifying logo)、 M220、M235、M238、M275、M280、M305( Unifying Version,with Unifying logo)、M310、M310t、M320、M325、M330、M34.
eBay