Product specification: Built-in Bluetooth + Microphone Support hands-free calls. Support advanced audio transmission mode. Support the clock indicating while power is off. High-quality digital stereo FM radio Support three-band radio store FM1-FM2-FM3, and can preset 18 radio stations. (Radio frequency: 87.5-108MHz) Support USB/SD/MMC card reader. Support audio: MP3/WMA/WAV formats and so on. Support folder play function Support breakpoint memory and ID3 play. Support remote control. Rotary electronic volume control MP3 play supports pause /preview/repeat/random play and 10 tracks up/down selections. Electronic type bass/treble/left and right balance/front and back balance volume control Multiple EQ scenario mode choice: jazz, rock, pop, classical, etc. Support mute and equal loudness (LUOD) control. Front AUX audio input hole and rear terminal L / R audio RCA output hole. 4 track high-power output (4 high-power loudspeakers) 60W*4 Work Voltage: DC10V-14V Include the installation size of the metal frames (mm): 182(width)*52(height) Body Size: 178MM (Width)*50MM (H)*68MM (D) Shape Size: 188MM*58MM (H)