【Product Name】 VAXEE VXD02 Receiver 4K Receiver for Gaming Mouse 【Description】 This is a receiver that allows VAXEE wireless mice to have a 4000Hz polling rate. There are some minor scratches, but no major damage. Operation has been confirmed at the time of listing. For those who own a compatible mouse, how about it? This is a listing for the receiver only. This is a used item, so it may not be suitable for those who are sensitive to such things. If you have any concerns, I will add photos, so please contact me through the question section. 【Manufacturer's Website Description】 VXD02 (4K) Receiver Compatible with the following wireless mice: XE, NP-01S, AX. After purchase, download the 4K firmware update and complete pairing, 4K and 2K polling rates will be available. It cannot be used interchangeably with the 1K receiver (VXD01). If you need to switch between two computers, please refrain from purchasing. By combining the "VXD02 (4K) Receiver" and 4K firmware, VAXEE wireless mice support "4,000Hz" and "2,000Hz" polling rates (4K / 2K / 1K / 500 / 125Hz) The higher the polling rate value, the more times the mouse and PC communicate, and the faster the response speed. Example: In the case of "4,000Hz", 4,000 signals are sent per second. If you already own a wireless mouse, you can enable 4K support by purchasing only the "VXD02 (4K) Receiver".