A4TECH FB20S ICY WHITE MOUSE LED Final assembled weight including battery/feet/screws/paint/coating

Final assembled weight including battery/feet/screws/paint/coating is ~42 grams for Small and ~47 grams for a medium

the mouse fits naturally in the hand

Zero Frozr: The fans completely stop when temperatures are relatively low

From the manufacturer

A4TECH FB20S ICY WHITE MOUSE LED Final assembled weight including battery/feet/screws/paint/coatingBluetooth 2. 4GHz Up to 3 Devices: Bluetooth x 2, 2. 4GHz x 1 , Sensor: Optical Distance: 5~10 m Report Rate: 125 Hz DPI: 1200 1600 2000 Buttons: 4 Style: Symmetric Receiver: Nano Receiver Includes: Wireless Mouse, 2*AAA Batteries, Nano Receiver System: Windows Mac Chrome OS Android..