Hi-SHOCK DLP-link 3D glasses adopt authorized DLP-link communication technology, the glasses gain DLP-Link sync pulse from the projected picture to implement the left/ right lenses ON/OFF switching, thus no need IR emitting device. Turning on the DLP 3D mode on your video terminal, you can enjoy exacting 3D big show without any additional setting. Specification Weight (contain battery) : 45g Shutters: Light-speed LCD shutter Power management: Power button and auto-standby Field rate: 120HZ Contrast ratio: 1000:1 Transmittance: 38+/-2% Sync operation: DLP-Link pulse Operation temperature: 0°C-40°C Storage temperature: -10°C-75°C Power supply: rechargeable battery Battery life: 35hours continuously working Comfort: flexible earpieces, rubber nosepiece Product Feature: 1) Excellent color accuracy& high contrast bring you optimal 3D viewing experience 2) High-tech light-speed LCD shutter technology 3) Stylish appearance 4) Intelligent synchronization 5) Authorized DLP-Link communication 6) Lightweight & comfortable 7) Energy efficient 8) Auto-standby 9) Auto low power detection 10) No need emitter