1. Uses a 433MHz radio remote control, and the remote distance can be up to 150 meters in open area. 2. Built-in high quality audio decoder IC. 3. Supports to play MP3 and WAV formats audio files. 4. Built-in 8MB flash memory and equipped with a micro-SD slot and USB connector. 5. Supports maximum 32GB micro-SD card and 32GB USB pen drive. Built-in a 50Wx2 class D amplifier and the audio output is powerful. Supports to direct play 999 audio files through pressing numeric keys on the remote control. to set a sound to be played in a loop. Sound volume can be saved after power-off. With card reader function, possible to access the micro-SD card via USB connection to computer. to drive an external warning light when it is playing a sound. Equipped with a 3.5mm audio output jack that can be connected to an external amplifier or an active speaker. With the features of play/pause, volume up, volume down, next and previous. Wide range for power input DC (12V - 24V). Industry-grade design and strong anti-jamming capability. Working voltage: DC 12V-24V Working current: ≥8500mA 12V (when it has two 50W speakers);≥4250mA 24V (when it has two 50W speakers) Power Consumption: ≤100W Audio format: MP3 or WAV (less than 16bit) Remote distance: ≤150m Color: As Shown Material: Metal+Plastic Package Contents: 1 x Wireless Remote MP3 Player 1 x Remote control Only 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.