Features: Uses a low-temperature-drift crystal oscillator and high-precision DDS frequency synthesis technology for high frequency stability, with resolution and low-frequency accuracy up to 0.001 Hz. Supports up to 13 standard waveform outputs, including sine, square, triangle, forward sawtooth, reverse sawtooth, ECG, half-wave, Lorentzian, Gaussian, Sinc, exponential rise, exponential fall, and 7.83 Hz Schumann wave. Features a color 1.8-inch TFT LCD display and digital keypad for direct frequency input—intuitive and easy to operate. Includes auto power-off timer, signal LED brightness adjustment, and screen backlight brightness control. FG-300 is a multifunctional, high-precision, portable signal generator suitable for electronic R&D, production testing, education, maintenance, and audio testing. Built-in spiral antenna enables Schumann wave generation. All settings are automatically saved and retained after power-off—no reconfiguration required on startup. Specifications: Frequency Range: - Sine wave: 0.001 Hz – 200 kHz (amplitude flat up to 100 kHz; amplitude decreases and distortion increases above 100 kHz) - Other waveforms: 0.001 Hz – 20 kHz (maximum adjustable frequency is not strictly limited; higher frequencies may result in increased distortion and jitter) Output Amplitude: 2.5 V Output Impedance: 330 Ω Display: 1.8-inch TFT LCD Power Supply: USB Type-C Color: Green Construction: PCB, electronic components, and plastic housing Note: Minor variations in printing or silkscreen between batches may occur but do not affect functionality.