Specifications Dimensions: 35 x 18 x 8.8mm / 1.4 x 0.7 x 0.4 inches Net Weight: 6.6g Frequency: 72MHz No. of Channel: 4ch Modulate: FM/PPM Operating Voltage: 4.8 - 6V DC Operating Current: 17mA Max. Distance Range: 1200M / 3900ft Crystal Size: None System: Single Conversion and Synthesized Selectivity: Better than 2.0V, +8 kHz at 65 dBdown Filtering: Dual turned RF circuitry, Dual 4 pole ceramic filter, DSP filtering with mild algorithm Shift Polarity: Positive or Negative (autodetect) Intermediate Frequency: 455KHz IP3: +9dBm This is special edition bundle with RCECHO Apps license key included for more fun!. RCECHO is a registered trademarks. Products only distributed by authorized seller.