Model purchase Single channel receiver The specific models that support most of the mice with the Youlian logo are as follows: Mouse (not exhaustive list only for reference): M235, M280, M310, M310T, M320, M325, M330, M335, M340, M345, M350 pebbles, T400, M505, M510, M515, M525, M545, M546, M560, M570, M585, M590, M600, 0, M705, M720, M905, M950T, M950, MX MASTER 23, MX ANYWHERE2, 2S, etc. Special model: There are two versions of these models, please contact customer service to confirm. M185 (Youlian Version), M186 (Youlian Version), M215 (Youlian Version) M238 (Union Edition) M305 (Union Edition), M275 (non-black shell and blue background) [Several special Union models M545, M546, M570, M705 that are not supported] Coding software download address: (URL is all lowercase) 6MM six channel receiver mouse: M235, M280, M310, M310T, M320, M325, M330, M335, M340, M345, M350 pebbles, T400, M505, M510, M515, M525, M545, M546, M560, M570, M585, M590, M600, 0, M705, M720, M905, M950T, M950, MX MASTER 23, MX ANYWHERE2, 2S, MX VERTICAL, etc. keyboard: K230, K270 (Youlian version), N305, K340, K375S, K350, K400R, K400PLUS, K470, K520, K580, K700, K710, K750, K780, K800, MX KEYS, CRAFT, etc. Mouse and keyboard suit: 70 (Youlian Version), 30, 65, 20, 40, 45, 10, 50, etc. There are 2 versions of these special models mouse: M185 (Union Edition), M186 (Youlian version), M215 (Union Edition) M238 (Union Edition) M305 (Union Edition), M275 (non-black shell and blue background) hint: for compatible with Logitech six-channel Youlian receiver (the new version of Youlian receiver will be produced after 16 years Second, the outer joint is black; the old version is mostly produced batches before 15, and the outer joint is Black and white edges, Both are six-channel, which is stronger than the new version of the external connector (Not easy to loosen) Six channels can be connected to 6 keyboards or mice with Youlian logo at the same time All for compatible with Logitech genuine mice/keyboards with the (Union) logo on the bottom cover Can be paired Coding software' download link: (URL is all lowercase) Single channel can only be connected to the mouse (not to the keyboard) One-to-many connection: A miniature receiver can hold up to six Unifying devices. Plug it in and leave it, then connect an additional mouse and keyboard to the computer. Download Unifying software to quickly add all your devices to one receiver. For ease of mobility and a great experience, place your mouse and keyboard in your workplace, home, and computer bag. They can always be used via the USB port. Specification: Type: For compatible with Logitech Unifying receiver Material: ABS, metal Product color: as shown Package includes: 1 receiver 1803. We maintain a high level of responsibility for our customers and are as responsive as possible to the needs of our guests. 1804. If you have any questions about our products, please contact us in time, we will solve it for you immediately! 1805. Due to the different display devices, the color of the products may have some discrepancies, hope you can understand. 1806. Due to the different photo shooting angle, the actual shape and size of the product may not be consistent with the picture, please refer to the description of the product size, everything shall be subject to the physical object received. 1807. Thank you for your purchase, we sincerely wish you happy every day.