Hxhsgmeh Using quartz crystal to stabilize the frequency, the emission frequency no longer drift when the temperature changes.Full frequency band (76-108MHZ) automatically searches for signal frequency bands and stores memoryBuilt-in rechargeable carp battery and charging circuit, you can charge it with a mobile phone charger, the charging light is brightred light, full of bright green light;Work Voltage:DC 3.0V~5.0VOutput impedance:8ohmOutput power:5WOutput channel:Mono for speaker and Dual channel for earphone(Ordinary 3.5mm diameter stereo headphones can be used, but if you purchase one with a shell, Please note: the diameter of the headphone handle must be less than 7mm! Otherwise, it not be inserted.)Frequency:87.0MHz~108.0MHz(Disable Campus Broadcasting Band)Frequency:76.0MHz~108.0MHz(Enable Campus Broadcasting Band)Equivalent noise: equal 30dBBattery model: 18650Battery capacity: 1000MAH, fully can last about 7-8 hoursWork Temperature:-40℃~85℃Work Humidity:5%~95%RHNote: It's diy kits. Need to solder by yourself.Colour:Photo ColorMaterial:PCB+electronic componentstype:C: Kit (without battery and speaker)Package Contents:1 x FM Radio Receiver Module Welding KitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.