This is the Futaba R124H 72MHz AM 4-Channel Mini Receiver without Crystal. FEATURES: Narrow-band spacing and superior signal filtering combine to provide exceptionally clear, interference-free reception and amazingly smooth, accurate control. One year limited warranty INCLUDES: One Futaba R124H 72MHz AM 4-Channel Mini Receiver without Crystal REQUIRES: One FUTL47** (Low band crystal) or FUTL48** (High band crystal) SPECS: Length: 1.5" (37.5mm) Width: 1" (25.6mm) Height: 0.60" (15.3mm) Weight: 0.52oz (14.8g) COMMENTS: Special Notice about Frequency Changes- *72MHz- Low band channels 11 to 35; High band channels 36 to 60. Receiver crystal channels (11-35 or 36-60) Within Each Band Can Be Changed, and Do Not Require a retuning of the receiver. *72MHz Frequency Band (Low or High) for the receiver Cannot Be Changed from Low to High band, OR from High to Low band without sending it into Futaba Services for retuning. *50MHz, 72MHz, 27MHz and 75MHz Frequency Bands Cannot under any circumstances be interchanged with each other. The receiver Must be sent in for retuning to the appropriate band. *50MHz, 27MHz and 75MHz receiver crystals Can be changed anywhere within the respective bands. There are no High or Low bands such as the 72MHz band has. *Transmitter Crystals Cannot be changed to another channel except by a licensed service center. It is against FCC regulations, and illegal for the user to change a frequency determining component of a transmitter. If the radio is not retuned, it can be a hazard to spectators, modelers or property, and void AMA insurance coverage. *Check with the local R/C club for the frequencies used in your area. jxs 5/13/05 ir/jxs updt jxs 5/19/05 updated jpg 7/21/05