The 403B is a small compact micro red dot optic. Employing Holosuns LED technology, the lifetime for one CR2032 battery can be up to 5 years. This optic features our Shake Awake technology that powers the optic on with slight movement of the 403B. It may be installed on various firearms such as shotguns, pistols ,air rifles and crossbows. The HS403B is compatible with standard mounts.

Shake Awake™: Another great piece of technology created by Holosun is Shake Awake™. This great feature allows an optic to automatically go to sleep when the unit has not detected any type of movement or vibration in a specific amount of time that is programmable by the operator. However, once the unit senses movement, it will automatically turn itself on and recall the last brightness that was used. This great feature helps promote battery life further and insures the unit is on and ready when you need it!

Features

• - Precision CNC machined from T6061-T6 aluminum
• - 50,000 hours of operation on one battery; 25,000 hour battery life on setting 10
• - Designed for day and night use; Red - 2 MOA dot size; memory function for brightness setting
• - Unaffected by extreme weather conditions
• - Low mount & 1/3 co-witness (AR) mount included (Works with Picatinny & Weaver rails)
• - Shake Awake automatically turns optic on when movement is detected, optic will auto shut off when no movement is detected
• - Powered by 1X CR2032 Lithium battery (included)