Features: Using advanced digital auditory signal processing technology (DSP) and FM phase-locked modulation technology (PLL) to make the sound quality more realistic, more stable performances Long-time operating frequency without offset Receiving signal is good, the local can receive 22 stations. LCD display is more intuitive and accurate, with very low power consumption and very little noise interference. Built-in 30 levels of digital volumes adjustment, with automatic search for stations and storage of radio stations, easy to operate and use. Adopt crystal frequency stabilization, temperature change transmitter frequency no longer drift. Full frequency band (76-108MHZ) automatically search for signal bands and store memory. Power down automatically memorize the data before power failure. Built-in rechargeable lithium battery and charging circuit, with a cellphone charger can be charged, charging redish light, and full green light; Specifications: Size:as pictures Support speaker: 4ohms Output power: 5W Frequency response : 50Hz-18KHz Sound channel: with the speaker for mono, with headphones for 2channel Ordinary 3.5mm diameter stereo headphones can be used If you buy with cover need to pay attention to: headphone handle diameter must be less than 7mm ! Otherwise, it can not be inserted. Receiving frequency adjustment : 76.0MHz-108.0MHz Supply Voltage:4.0V-5.5V Current 500MA-2A Package Includes: 1Set FM Radio Assemble Kit note: Due to problem of lighting effect and shooting there might be tolerances in product, please understand. Please allow 0-2mm error due to manual measurement.