MP3 Player, USB Reader, SD CARD Reader, MMC CARD Reader, AUX Rechargeable Battery (included) & 12V Car Battery Operation All ABS Body, Sturdy Yet Light Weight, Long Range & Efficient Design Built-in Siren, Player USB AUX input SD/MMC Card Chargeable or Recorder (16 sec.). Microphone with Volume Control & Press-to -Talk Switch. Power Output : 50WWMax. Voice Range : 0.5km (1.2km in quiet Area). Power Source : 12V DC, 8 x UM-2 Cells / Car Battery. Microphone : Omni Directional Dynamic. Dimensions/Wt. : Horn 230mm, Length 350mm / 2.0kg.