Mini speaker 4ohm 3w sound cavity adopts high-end built-in magnetic speakers, stable performance, tight sealing, convenient and reliable, clear sound, providing a long timefor you! Frequency Characteristics: Rated power: 3 (W); Rated impedance: 4 ohms (Ω); Frequency response: 500-20K (kHz). Size: Full frequency cavity, 31 mm long, 28 mm wide, 15 mm thick. Shape: Rectangle; Diaphragm material: non-paper; Magnetic circuit form: internal magnetic. 4pcs 2" 4Ohm 3W Full Range Audio Speaker Stereo Loudspeaker for Robot; for Raspberry Pi; Advertising Machine; Game Machine; Integrated Machine Special Speaker Package Included: 4 x Mini Speakers