Applicable M odel : for Unifying Mouse [Mx master, M950T, M950, Mx Anywhere2, M905, M705, m720 M525, M515, M510, M505, T620, T400, M345, M325, M310, M310T, M320, M305 (Unifying), M235 (Unifying)], etc. for Unifying Key Board [K400r, K750, K800, K520, K710, K780, K270 (Unifying), K230, K340, K350, N305, K340], etc. for Unifying Keyboard and Mouse Sets [MK365, MK520, MK710, MK270 (Unifying), MK330].
eBay