Please follow thoseSteps: 1. push NV button first 2. push up button several times 3. push NV button again, the red dot will be on, and please use CR2 3V or CR123A battery, make sure the spring of the battery cap contact the positive pole of the battery. if you insist to use the CR123A battery, please take off the out package of CR123A battery, and it will work with exps3 Free Shipping 2021Ver. EXPS3: improved battery pouch, more real details made by 7075 Aluminim, fully restored the origina EXPS3 details, it can hold GBB impact force, 550g impact force Very clear lens, highly transmittance, no mirror effect, it doesn't reflect your face or something else etc Outtershell hard anodized, Red Dot is EXPS3-0 Red dot, with NV fucntion. compitable with NVGs under strong light enviroments, the red dot still very clear. no problem to aim.
