This is an R156F 6-Channel 72MHz FM Receiver "Without Crystal" from Futaba. FEATURES: Narrow-band spacing and superior signal filtering combined to provide exceptionally clear, interference-free reception and amazingly smooth, accurate control Perfect for Park or Slow Flyers Range of approximately 650 feet (200m) This covers the complete 72mhz band INCLUDES: One R156F 6-Channel 35MHz FM Receiver without Short Crystal REQUIRES: "Short" Crystal If utilizing all 6 channels a Y-harness is needed, HC SPECS: Narrow Band: 20kHz Power Requirements: 4.8 to 6.0 volts (shared with servos) Current Drain: 10mA Length: 1.3" (33.3mm) Width: 0.51" (13mm) Height: 0.84" (21.4mm) Weight: 0.36oz (10.2g)