Item Type: SDR QRP HF Transceiver_x000D_Working Range: 10kHz to 220MHz_x000D_Tuning Step Size: 1Hz, 10Hz, 1kHz, 5kHz, 10kHz and 1MHz_x000D_Intermediate Frequency (IF) :455KHz_x000D_20 Band Presets: BCB and HAM frequencies (shortcuts)_x000D_Mode: Generator function mode_x000D_RX OR TX Mode Selector: For Homebrew QRP transceiver_x000D_Bar graph of signal meter via analog input (ADC)_x000D_Uses: _x000D_1. Used as a local oscillator on for Homebrew radio receivers (such as superheterodyne, SDR, direct conversion and for Homebrew QRP transceivers)_x000D_2. Used as a simple RF/clock generator for calibration reference or clock generation_x000D_3. Can be used with for Pro Mini_x000D_Universal 128x64 I2C for OLED for SSD1306 display and Si5351 module_x000D_Transmission: I2C data transmission, only need 2 wires to connect the display or Si5351_x000D_Battery Information: 3.7V lithium battery, 600mAh 1SELF 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 transceiver 2BAR 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 generator 310KHZ TO 220MHZ WORKING RANGE: Working range is 10kHz to 220MHz, can be used with for Pro Mini. Use general 128x64 I2C for OLED for SSD1306 display and Si5351 module 42 WIRES TO CONNECT: Support I2C data transmission, only need 2 wires to connect the display or Si5351, very convenient 5HIGH STABILITY AND ACCURACY: Frequency generation has high stability and accuracy, simple but very effective and free 1 x SDR QRP HF Transceiver 1 x USB Data Cable 1 x Connector You need to read the parameters carefully before making a purchase.