The CompM4s Sight from Aimpoint is a high quality Sight with a Proven Track Record
The Low battery compartment that offers a battery life of up to 8 years of continuous use from just 1 AA Battery.
Not only does this unit have an extraordinary long battery life, but it is also is a high quality dot sight with:
7 NVD-compatible brightness settings
9 daylight settings
including one extra-bright setting
Shipped complete with a QRP2 mount and standard AR15 spacer
KillFlash anti-reflection device
MILSPEC rubber lens covers.