Signstek Nano ARM DS212 Portable Mini Handheld Touch Screen Digital Storage Oscilloscope It is widely applicable inacademic experiment, electronicsmaintenance, electronic engineering tasks, etc. Only 1 button with Touch area, operated with the gestures of one-click, double-click, press and slide Equipped with 320*240 color display, 8M Memory Card (U Disk), and chargeable Lithium batteries This pocket size oscilloscope is a 2-channel digital oscilloscope It supports SD card USB flash disk storage and USB charging