RF Design for Easy Operation 3D RF Active Shutter Glasses for use with all JVC 3D projectors Requires PK-EM2G 3D RF Emitter Optically matched for high brightness and color accuracy Can be switched for 2D viewing with 3D/2D Mode Select USB charging cable and protective bag provided 100 hour operation with full 2.5 hour charge Compatible with PK-EM2G 3D RF Emitter. As a set, the PK-AG3G & PK-EM2G may be used with previous JVC 3D Projectors Not compatible with PK-EM1 3D IR Emitter Weight: 1.34 ounces *Note: Not intended for older ALR Screens