Corsair Harpoon Vs. Logitech G400s
The Harpoon by Corsair uses an Optical sensor from PixArt, specifically the PMW3320, providing a DPI/CPI range of 250 - 6000dpi. It uses a USB connection with a 1.8 m Braided Fiber cable. It weighs in at 85 g without the cable and is approximately 111.5 x 68.3 x 40.4 mm (LxWxH).
The G400s by Logitech uses an Optical sensor from Avago, specifically the ADNS-S3095, providing a DPI/CPI range of 200 - 4000dpi. It uses a USB connection. It weighs in at 133 grams with the cable.