Audio Unlimited SPK-VELO-001 Water-Resistant Wireless Speakers with Remote (Old Version) 900 MHz transmitter sends audio signals without speaker wire Weatherproof for outdoor listening Speaker can be up to 150' away from audio source Compact & portable with a stylized design (10H x 5W) - 3 Rubber edge Woofer2 Mylar cone Tweeter10 Watt RMS Output9V DC Transformer Phase Loop Lock circuitry automatically locks in and keeps audio signal clear and strong.