Shield has taken the incredible performance and strength of their military proven red dot sight the CQB/CQS and made it even better with the SIS2. The fantastic performance, weight and durability have been given an extra dimension by the added convenience of 4 switchable reticules and brightness adjustment settings via the touch of a button. Now not only do their sights automatically change brightness to suit your environment but they added the simplicity of a manual mode for you to set your sight to perform in the exact conditions you require.