Sold as 1 Each. Built-in amplifier (12 watts RMS x 2 speakers) so there is no need for outside amplifier or receiverjust plug into source and play. Frequency response 70 Hz to 20 kHz ±9 dB. Includes speaker connecting cable, 3.5 mm to dual RCA audio cable, and user manual. Connects to any device that has a 3.5 mm headphone output or dual RCA outputs. 4 in. bass driver and 13 mm silk domed tweeter in each speaker. Dual RCA inputs to avoid tedious plugging and unplugging. Flared bass reflex port enhances overall bass sound. Suitable for desktops, laptops, TV, record players, and much more. 100% medium-density fiberboard wooden enclosure with classic black wood finish.