Active 3D Glasses with High-speed Shutter Technology and Wear over Prescription Eye-wear: *LCD refresh rate: 120 to 480Hz *Sync:DLP®-Link™Signal *Used with DLP-LINK projector *Watch distance: 15M *Power supply: CR2032 button cell *Ratio: 1000:1 *Transmittance: 38 ±2% *High-speed shutter technology *300 hours continuously working time per cell *No ambient light interference *Lightweight:50g *Wear over prescription eye-wear *Stylish appearance *No installation *Flexible earpieces *Auto on/off *Low power detection *Replaceable battery *OEM/ODM service provided