RAPOO 1620 2.4G Wireless Mouse Black, 1000 DPI, Long Battery. Retail Pack 1000 DPI high-definition tracking engine You'll enjoy responsive and smooth cursor control with the 1000 DPI high-definition tracking engine. Up to 9-month battery life With Rapoo's latest energy saving technology and power switch, you can use your mouse without power interruption for up to 9 months. Reliable 2.4GHz wireless connection Reliable 2.4GHz wireless connection with up to 10-meter working range.