Size: for Optoma Projector IR Remote ControlSpecifications Remote Controller BR-3043N / BR-3047N / L-27-7KEYMaterial: Plastic, Silicone RubberMeasurements: 52 x 149mmWeight: 0.130 lbsReception Range: Not Exceed 22 Feet (7m)Batteries Required: 2 x AAA (NOT Included)Compatible with Optoma Projectors:DS211 DS216 DS216L DS316 DS316L DS322 DS323 DS325 DS326 DW312 DW318 DX319 DX619 DX621 DX623 DX626 ES521 ES526 ES526B ES526L ES529 EW531 EW536 EX521 EX525ST EX531 EX531P EX536 EX536L EX538 EX605ST EX605ST-EDU EX612 EX665UT EX665UTi EX665UTis PRO150S PRO160S PRO250X PRO260X PRO350W PRO360W TS526 TW536 TX536 TX612 S300 X300If the Remote Control Does Not Work1. Check the operating angle of the remote control is within ±15°, both horizontally and vertically of one of the IR receivers on the projector.2. Make surethere are not any obstructions between the remote control and the projector. Move to within 7 m (±0°) of the projector.3. Make sure the batteries are inserted correctly.4. Replace batteries if they are exhausted.