Brand new projector remote control, no programming, paring or setting is needed. Just install new batteries (NOT Included), it will work reliably. Compatible projector models: DS327 DS329 DS550 DS551 DX327 DX329 DX550 DX551 ES550 ES551 EW605ST EW605ST-EDU EW610ST EW610ST-EDU EW631 EX550 EX551 EX605ST EX605ST-EDU EX610ST EX610ST-EDU EX631 FW5200 FX5200 TS551 TW631-3D TX551 TX631-3D Notice: Make sure there's no obstacle between the remote control and projector when operating the device. Warranty: Refund available within 30 days, replacement available within 12 months from order date.