It can connect an external 3.5mm AUX cable(included) as a wired headset,suitable for smartphone,pads,PC,etc.Frequency range:50-108 MHZ.FM digital radio headphones with built-in mic which have super receiving sensitivity and stable/clear signals.It allows you to enjoy clear FM music,news at home or while Jogging, walking, cycling outdoors.It powered by built-in rechargeable lithium battery (650mAh), which runs up to 24 hours. Specifications:Material:ABSSize:Approx. 4.75x 4.75inBattery Capacity: 650mAhWide Range:FM 50-108MHzWorking Voltage:DC 3V,AAA 1.5Vx2Frequency Range:50-108MHzQuiescent Current:100uAFrequency Response:200Hz-20000HzMax Power Output: 3.2mw Note:Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes:1x FM Radio Headphone1x 3.5mm Cable Our products are made with the splendid quality materials and are designed to provide you with the best possible user experience.