Features: Using professional audio to process and analyze audio signal, auto mute when there is no signal or week signal as big FM base noise, in order to get rid of the annoying rustle of traditional FM radio. Operating frequency range: 88-108MHz, Supply voltage: 3V (2AA). Audio output: Stereo (determined by the radio system). Function: Adjust the frequency and volume by pressing the button, there is a power switch button. Number of receiving stations: determined by the number of local broadcast stations and the broadcast environment of the receiver. Specifications: Material:Metal Size: Approx.6x3.5x2cm/2.36x1.37x0.78inch Operating frequency range: 88-108MHz Audio output: Stereo (determined by the radio system) Supply voltage: 3V (2AA) Weight: 17 grams Function: Adjust the frequency and volume by pressing the button, there is a power switch button Number of receiving stations: determined by the number of local broadcast stations and the broadcast environment of the receiver Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3.Headphones and batteries are not included, and headphones and batteries are required. Headphones need to use 3.5mm plugs for two-channel headphones, and the batteries are two AA batteries. Thanks for your understandings. Package includes: 1x FM Radio Module