Feature: 1. DLP Link Sync Method: Active shutter 3D glasses use DLP Link as its sync method, which is quickly compatible with all DLP Link projectors, with just a few simple settings, you can have an immersive 3D 4K home theater with you. 2. 144Hz Refreshness Rate: The 3D glasses use Active Shutter technology with an ultra fast 144Hz refreshness rate, high definition, no ghosting images, and no flicker to provide you with a great 3D viewing experience. 3. Compatible: 3D glasses compatible for Vivitek, for Dell,, for LTV 2500, for LTV 3500, for Vanish TV projectors etc. Long time wear, not easy to fatigue. 4. Rechargeable Battery: The 3D glasses have a built in rechargeable battery that can work continuously for 45 hours and 180 days of standby time after charging with USB, with automatic 5 second standby and 5 minute shutdown, saving power and stability. 5. Simple Operation: If you use 3D active glasses but can't see the 3D effect, just click the power button again in a single click to flip the view of the left and right eyes to achieve synchronization. Specification: Item Type: DLP Link 3D Glasses Material: PC, LCD Color: Black Battery Type: Li Polymer Battery (Ship with Inbuilt Battery) Battery Capacity: 80 mAh Light Transmittance: 38%±2 Contrast Ratio: 1000:1±200 Synchronization Frequency: 96/100/120/144Hz Synchronization Mode: White DLP LinK. Package List: 1 x Glasses (Ship with Inbuilt Battery)1 x USB Cable1 x Dust Free Cloth1 x Storage Bag1 x User Manual Note: No monitor support, normal TV