Logitech (910-005931) USB Unifying Receiver ; Windows 7 or later , Mac OS 10.10 or later; 32.81' / 10 m ; 0.59 x 0.35 x 0.24" / 15 x 9 x 6 mm; 0.04 oz / 1.23 g ; 0.05 lb ; 7.9 x 5 x 0.55.