The osight s features a magnetic charging cover; shake awake; auto sensing; multiple reticle system- 2 moa dot and 32 moa circle; motion sensor off/on; three adjustable brightness settings: a default level, an extra bright level, and a dimmer level, users can adjust and select the ideal brightness that aligns with their preferences; energy saving function and common rmsc footprint.Battery Size: Rechargeable Li-ionMagnification: 1xEye Relief: UnlimitedLength: 1.77"Reticle: 2 MOA Red Dot/32 MOA CircleProofs: Water/Weatherproof