Product Introduction: FM campus radio frequency band reception. Using PVC material panel, high-quality and non deformable. Good sound quality, loud and clear. Can be powered by 2 No. 5 batteries. Frequency range: FM: 76 - 108MHZ, AM: 530-1600khz. External power supply: DC 3V (2PCS AA batteries) dry battery, not included. Powett output: 100mw. Noise reduction ratio ≥ 34db. Speaker: 57mm/8ohms/0.5w.