Features: brand new and high quality UHF frequency band (780-789MHz) and PLL frequency technology for reliable performance. UHF780-805 frequency band, 6 selectable channels. 2 pcs AA batteries last for more than 30h operation, low power consumption. Multiple sets of receivers can be operated with a single transmitter within the operation range. Dynamic expansion circuit, high S/N ratio. Anti-interference circuit allows 4-6sets operate simultaneously without mutual interference. Receiver LCD displays frequency, channel and battery level. Specifications: Transmitter: Frequency Range: 780-789MHz Operation Current: 80mA10mA Power Supply: DC12V/300mA Operation Range: 50m Transmitting Power: 10dBm Size: approx. 150x105x35mm/5.91x4.13x1.38in Receiver: Power Supply: DC 3V (2pcs AA batteries) Operation Current: 50mA20mA Frequency Response: 60Hz-18KHz S/N Ratio:50dB(A+) Sensitivity: S/N:3uV(SINAD>12dB) Frequency Range: 780-805MHz Stereo Crosstalk:42dB Size: approx. 110x62x20mm/4.33x2.44x0.79in Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1PC x Receiver 1PC x Transmitter 1Set x Earphone 2Pcs x AA battery 1PC x 3.5 to 6.3 gold plated connector 1PC x Power adapter 1PC x RCA cable 1PC x Conversion cable 1PC x User manual