Compact Size-The PRO 510XL is small enough to fit almost anywhere. Superior. engineering and microelectronics insure the same quality and performance of larger units. Microphone-Connect the rugged professional quality microphone included with unit. S/RF Meter-An accurate 4 segment LED meter shows the signal strength of the receiver and transmitter. TX LED-Lights to indicate when the unit is transmitting. Channel Display-A large LED display shows the current channel in use. Channel Selector-An oversize channel knob makes it easy to select any of the forty. channels. Squelch Control-Adjust the threshold of the receiver to eliminate background noise. whenever a transmission is not being received. Volume Control-Turn the unit on or off and adjust the volume. ANL Switch-The Automatic Noise Limiter helps reduce unwanted noise for better. reception. Mounting Bracket- All mounting hardware is included for most any installation. Channels: 40 AM. Frequency Range: 26.965 to 27.405 MHz. Frequency Control: Phase Locked Loop (PLL) synthesizer. Frequency Tolerance: ±0.005%. Operating Temperature: - 30 to + 50 C. Microphone: Metal Type- Electret. Input Voltage: 13.8 VDC nom. (+ or- ground). Current Drain: TX - full mod 1. 7 A. RX - with max. audio 1.7 A. Size: 4 1/2"W x 6 3/4"D x 1 3/8"H. Weight: 1 lb. 9 oz. Antenna Connector: UHF SO 239. LED Meter: Indicates relative RF output and received signal strength. Sensitivity: 0.5 uV for 10 dB: (S + N)/N typical (limit: 1.0 uV). IF Frequency: Double Conversion Superheterodyne 1st - 10.692 MHz 2nd - 450 KHz. Automatic Grain Control: (AGC) - less than 10 dB change in audio output for inputs from 10 to 50K microvolts. Squelch: Adjustable - threshold less than 1 uV. Audio Output Power: 7 Watts max. into 8 ohms. Frequency Response: 300 to 2000 Hz. Distortion: less than 10% at 4 Watts 1000 Hz. Internal Speaker: 16 Ohms 3 Watts round. Power Output: 4 Watts. Modulation: Class B amplitude modulation. Frequency Response: 300-2500 Hz. Output Impedance: 50 Ohms unbalanced.