Goswot 144Hz Rechargeable DLP Active Shutter Eyewear for Optoma Acer Vivitek Dell LG and All The Other DLP-Link Projectors

UPDATE, seller contacted me and ship both replacements for the faulty ones, the works really good, no problem on sync or keeping charge as the ones replaced. Great CS.I bought the 3 pack, and received a pack with two boxes... one withe box with 2 units on it and a smaller box with pictures on it with 1 unit, the 3 looks identical, same location of the charge port, same shape... but two had the sensor LED left to right oriented, and 1 was right to left... the 2 identical did not hold charge as the other one, and one of them stop working in 3 weeks, also both had sync problems and couldn't keep sync further than 6 ft.... the other one had no problem sync and keep sync at even 9ft, and hold charge without problem.

it gives good 3d experience