Axis AT1901BT Watertight All-Terrain Water/Dust Proof AM/FM Bluetooth Multimedia System combined with Axis MA6502 2-Way Coaxial Woofer Speakers engineered for powerful sound and audio quality. Axis AT1901BT Watertight All-Terrain Bluetooth Multimedia System Product Details LCD Display with clock USB Input with 2ch Aux Inputs (Rear) MP3 Playback S/N Ratio: >55dB with Loud Impedance of 4-8 Ohms Frequeny Response: 20 – 20KHz A/D Conversion Filter: 16 Bit IP66 Watertight Water & Salt Protection PCB Coating Diecast Aluminium Housing Loud Impedance: 4-8 Ohms 155 x 104mm Face 134 x 85mm cut out 55mm Mounting Depth 20W x 4ch RMS Output @ 14.4V 40W x 4ch Peak Output @ 14.4V Bluetooth A2DP Audio Streaming Bluetooth Handsfree AM/FM Auto Seek Receiver FM 87.5~108 MHz; AM 522~1710 KHz Radio Regions: Australia, (Europe) and USA U Mounting Bracket USB Cable ISO Wiring Harness Axis MA6502 2-Way Coaxial Woofer Speakers Product Details Woofer: 6.5" or 165mm Polypropylene Cone Rubber Edge Tweeter: 13mm PEI Dome Voice Coil: 25mm KSV Impedance: 4 Ohm Magnet: 10 oz Ferrite Frequency Response: 55-22,000Hz Input Power: RMS: 40W - Max: 160W Mounting Depth: 60mm