DSO138mini brings in the following improvements: 1. Better structure and smaller size2. USB or battery powered. 3. External trigger input.4. Serial output of waveform data. 5. universal controller.DSO138mini make MCU and LCD stay in one PCB to avoid problematic pin-header connections that was used in DSO138. This not only increase product reliability but also allow the main board to become a flexible universal purpose controller.DSO138mini's trigger can work reliably under 10us and 20us timebase settings.Waveform data can be outputted through serial port and the data can be easily displayed on PC with help of other software like Gnuplot. This photo shows the same waveform displayed on PC using Gnuplot.Specification:Major features of DSO138Sampling rate: 1Msps maxBuilt-in 1KHz/3.3V test signalWaveform freeze (HOLD) function availableSave/recall waveformSerial waveform data output Vertical:Number of Channel: 1Analog Bandwidth: 0 - 200KHzSensitivity: 10mV/Div - 5V/DivSensitivity error: less than 5%Resolution: 12-bitInput Impedance: 1M ohmMaximum Input voltage: 50VpkCoupling: DC, AC, GNDHorizontal:Max Real-time Sampling Rate: 1MspsTimebase: 10us/Div - 500s/DivRecord Length: 1024 pointsTrigger:Trigger Modes: Auto, Normal, SingleTrigger Types: Rising/falling edgeTrigger Position: 1/2 of buffer size fixedDisplay: 2.4-inch color TFT LCD with 320 x 240 resolutionPower Supply: 3.5V - 6V DCSupply Current: 120mA@5VPhysical Dimensions: 7 x 8cm/2.76 x 3.15inchType: Finished Product / Spare PartsColour: RedMaterial: plasticPackage Contents:1 set x DSO138mini oscilloscope kitOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.