I liked mine very much. I use it as an AM IF radio reference source. A power cable comes with it that has a USB connector and will fit most laptops and IPad charging modules. While it only goes to 500Khz , it is spot on and stable at 455Khz. Its also great for Audio Sine wave work. The square wave rise time is so so., but other waveforms are clean. Output amplitude is 10 Volt PP up to 200khz. The instrument is well worth the price.