Zenith ZC800 8-Device Universal Learning Remote Controls Up To 8 Devices Learning Key Allows Programming Of Additional Functions From Your Original Equipment Remote Includes Advanced Functions For Satellite, Cable and DVR Devices Advanced keys for DVD and SAT functions, HD keys for aspect ratio, MTS and replay Easy to program with over 3700 codes Operates most digital TV set-top boxes, TV, HDTV, DVD, VCR, cable/satellite and AUX 4-Learning keys Requires 2 AAA batteries (not included)