Brand new projector remote control, no programming, paring or setting is needed. Just put in new batteries (NOT Included), it will work reliably. Compatible projector models: DS312 DS315 DS551 DX551 DX612 DX615 EP620 EP720 EP721 EP727 EP728 EW1610 TS551 TS720 TS721 TW1610 TW631-3D TX551 TX631-3D TX727 TX728Notice: 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.