Logitech G602 Vs. Zowie Gear EC2-B
The G602 by Logitech uses an Optical sensor, specifically the AM010, providing a DPI/CPI range of 250 to 2,500 dpi. This results in a tracking speed of 2 m/s - 80 IPS, and a maximum acceleration of >20G. It uses a Wireless/USB connection. It weighs in at 107g grams with the cable, has weights but the batteries can be used as weights and is approximately 139 x 83 x 44mm (LxWxH).
The EC2-B by Zowie Gear uses an Optical sensor from PixArt, specifically the 3360, providing a DPI/CPI range of 400/ 800/ 1600/ 3200. It uses a USB connection with a 2m cable. It weighs in at 90g without the cable and is approximately 120 x 64 x 40 mm (LxWxH).