The Bushnell AR Optics TRS-26 Red Dot goes beyond its historic predecessor with improvements in several key areas including longer battery life, bigger objective lens, and a sharper 3 MOA dot and push button operation. The TRS-26 is powered by 1 CR2032 battery and sets the industry standard with more than 50,000 hours of battery life. The TRS-26 now has a user-selectable auto-off timer that can also be turned off for defensive applications. The onboard logic allows you to select whether or not to engage the auto-off timer. When engaged, the timer will automatically power down the optic after no buttons are pressed for 12 hours ensuring the sight is always at-the-ready regardless of what brightness setpoint is chosen.