Product Description 1) 900MHZ High Frequency Technology 2) RF Technology lets you roam freely throughout your hourse, garden 3) PLL Auto Frequencies Scanning System 4) No Line of sight limitations 5) Magnetic Shielded Speakers 6) Virtually Interference free audio Quality 7) Mono / Left / Right Channels Selector 8) Auto ON/OFF Control 9) Auto-Tuning Function 10) Boost / Bass 11) Operated by AC/DC Adaptor or Batteries 12) Operation Distance: Up to 150 Feet (Open Area) Product Specification/Models Specification: 1) S/N Ratio: 50dB 2) Distortion: < 2% 3) Frequency Response: 40Hz - 12 KHz 4) Channel Separation: 30dB 5) Output Power: 3.5W RMS Speakers: 1) Auto Scanning 2) Bass / Boost selectable 3) 2-ways System 4) Magnetic Shielded Speakers 5) Operated by 6 x AA size Alkaline Batteries (not included) or 2 x 12V 550mA Adapter (included) Transmitter: 1) Auto ON/OFF 2) Flexible antenna 3) Audio cable; RCA cable; 3.5 mm to 6.3 mm adapter plug provided 4) 1 x 12.5V 150mA Power Adapter