Acoustic Audio AA321B Mountable Indoor Speakers 400 Watts Black Bookshelf Pair Acoustic Audio AA321B indoor mountable black full range speakers, recommended power is 20-400 watts, frequency response is 150Hz-20 kHz, efficiency is 88dB, 8ohm 2.5" polypropylene full range woofers, mounting brackets and hardware included, quick release spring loaded wire terminals Heavy duty ABS construction sealed cabinets, each speaker size (H x W x D) is 3.5" x 3.5" x 4.5", designed and engineered in the USA, full instructions included Use for surround sound, home theater, multiple room systems, industrial sound systems, bookshelf speakers, bathrooms, kitchens, car audio This listing and price is for 1 pair / 2 indoor speakers