With the frequency generator - Super Ravo Zapper - you don't have to buy extra "keys" with additional frequencies; you can operate the device without connecting it to a computer. You have the option to connect it to a computer to program new custom frequencies in addition to the pre-programmed ones. The device comes with 100 factory presets upon purchase. The device includes a USB cable for programming desired frequencies. The usable frequencies range from 1 Hz to 900,000 Hz (900 kHz), down to thousandths of a Hz (e.g., 393 kHz = 393,000 Hz), or as a sliding frequency band (e.g., 393-395 kHz). The Super Ravo Zapper's memory can store 740 presets (rows) - whether individual fixed frequencies, shifted frequencies, or complete frequency packages that the Super Ravo Zapper automatically runs consecutively within a single, continuous preset. This makes it very easy to customize the Super Ravo Zapper to your needs and take advantage of its unique output signal. The Super Ravo Zapper is not a medical device. The Super Ravo Zapper is a programmable, direct current, combined square wave generating, continuously variable frequency generator. Usage: frequency generator, also for laboratory work Technical parameters: Adjustable frequency: - Lower band: 1 Hz to 999 Hz - Higher band: 1 kHz to 900 kHz The rise time is approx. 30 nS. Sweep: - Lower band: 0.001 Hz to 0.255 Hz per second - Higher band: 0.001 kHz to 0.255 kHz per second (most common: 0.005 kHz) Adjustable output voltage: peak-to-peak approx. 5 - 15 V. Dynamic evaluation depending on the set frequency and output voltage Memory: 740 record spaces for presets and groups of different frequency ranges (PC) 16 x 2 character backlit display USB connector for communication with PC, allowing management of the device's language settings, presets, groups, and user texts. The Super Ravo Zapper is certified by certification body no. 3018, accredited by the Czech Accreditation Institute, according to ČSN EN 45011 in accordance with ČSN EN 61326-1:07. The Super Ravo Zapper is a registered trademark at the UPV of the Czech Republic. The SRZ program only runs on Windows platforms. Not yet compatible with Apple. Model 2022 - updated firmware, from the user's perspective the device has not changed.