DSO138mini brings in the following improvements: 1. Better structure and smaller size 2. 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 DSO138 Sampling rate: 1Msps max Built-in 1KHz/3.3V test signal Waveform freeze (HOLD) function available Save/recall waveform Serial waveform data output Vertical: Number of Channel: 1 Analog Bandwidth: 0 - 200KHz Sensitivity: 10mV/Div - 5V/Div Sensitivity error: less than 5% Resolution: 12-bit Input Impedance: 1M ohm Maximum Input voltage: 50Vpk Coupling: DC, AC, GND Horizontal: Max Real-time Sampling Rate: 1Msps Timebase: 10us/Div - 500s/Div Record Length: 1024 points Trigger: Trigger Modes: Auto, Normal, Single Trigger Types: Rising/falling edge Trigger Position: 1/2 of buffer size fixed Display: 2.4-inch color TFT LCD with 320 x 240 resolution Power Supply: 3.5V - 6V DC Supply Current: 120mA@5V Physical Dimensions: 7 x 8cm/2.76 x 3.15inch Type: Finished Product / Spare Parts Colour: Red Material: plastic Package Contents: 1 set x DSO138mini oscilloscope kit Only 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.