Check the listing for details. 4Pcs 3W 4Ohm Small Speakers Square Micro External Magnet Speaker 40x21.5mm Black. Condition: New. Listed at 20.21 USD. Application:Applied to mini box speakers, music player, doorbell, computer, multimedia speakers, DIY electronic toys, radio, interphone, multimedia speakers and so on.It's suitable for all kinds of sound source fabrication, the sound is clear and melodious without distortion.Specifications:Type: Round Micro Internal Magnet Speaker;Rated Power: 3W;Impedance: 4Ohm;Total Size: 40x40x21mm/1.57x1.57x0.83inch(L*W*H);Magnet Bottom Diameter: 21.5mm/0.85inch;Package Includes:4 x Stereo Speaker;Advantages:The Full-Range magnet speaker has high sensitivity, loud sound, good sound quality and high clarity, and is a great quality speaker to replace the audio system;The loudspeaker shell is made of metal material, fine workmanship, good performance magnets and rubber coils are safe, stable, not easy to break and rust, and can be used for a long time.