Gonbes New Rechargeable 3D active DLP-Link shutter glasses for 3D Projector DLP-Link technology, compatible with 96-144 Hz projectors, such as Optima, BenQ, Sanyo, Acer, Sony, Mitsubishi, VIVITEK, etc. Light weight, comfortable wearing, even for glasses wearer Excellent LCD lenses offer bright and sharp 3D experience,operation without emitter Built-in high quality chipset provides fast working Theres an LED that blinks when the battery runs lowcan be charged through USB rather than replaceable batteries