Wireless sound transmission. The transmitter connects to a headphone or RCA jack on TV, DVD, stereo, computer, etc. Automatic frequency search for easy connection. Switch for extra bass boost. The transmitter operates on supplied AC/DC adaptor. The speakers are powered by 6x AA/LR6 batteries per speaker (not included) or by the supplied AC/DC adaptor. Range max 100 m (unobstructed). Speaker size: 155x200x70 mm.