4" full range BSK speaker with 70V/25W power, 70Hz to 18kHz frequency response. Features waterproof and stainless steel grills and hardware, sold as each. The M4F725 Speaker is water-resistant mini-speakers with watertight front enclosures. It is perfect for showers, greenhouses, boats, jacuzzis, pool houses, locker rooms, atriums or gardens. White and small enough to go unnoticed in most environments, the BSK Speakers still deliver a quality sound experience.