Feature:1. SELF MADE EQUIPMENT: This is a VFO(Variable Frequency Oscillator) project, which can be used for self made equipment, such as superheterodyne receiver, DCR, SDR or Ham QRP transceiver2. BAR GRAPH INDICATOR: Also has a bar graph indicator for signal strength(S Meter) and 20 Band presets, and can also be used as an RF or clock generator3. 10KHZ TO 220MHZ WORKING RANGE: Working range is 10kHz to 220MHz, can be used with for Pro Mini. Use general 128x64 I2C for OLED display and Si5351 module4. 2 WIRES TO CONNECT: Support I2C data transmission, only need 2 wires to connect the display or Si5351, very convenient5. HIGH STABILITY AND ACCURACY: Frequency generation has high stability and accuracy, simple but very effectiveSpecification:Item Type: SDR QRP HF TransceiverWorking Range: 10kHz to 220MHzTuning Step Size: 1Hz, 10Hz, 1kHz, 5kHz, 10kHz and 1MHzIntermediate Frequency (IF) :455KHz20 Band Presets: BCB and HAM frequencies (shortcuts)Mode: Generator function modeRX OR TX Mode Selector: For Homebrew QRP transceiverBar graph of signal meter via analog input (ADC)Uses: 1. Used as a local oscillator on for Homebrew radio receivers (such as superheterodyne, SDR, direct conversion and for Homebrew QRP transceivers)2. Used as a simple RF/clock generator for calibration reference or clock generation3. Can be used with for Pro MiniUniversal 128x64 I2C for OLED display and Si5351 moduleTransmission: I2C data transmission, only need 2 wires to connect the display or Si5351Battery Information: 3.7V lithium battery, 600mAh.Package List:1 x SDR QRP HF Transceiver1 x USB Data Cable1 x ConnectorNote:You need to read the parameters carefully before making a purchase.