Two input channels. External Trigger input. Probe calibrator: 1kHz, 2Vpp. Resolution 8 or 9 bit. Vertical deflection: 10mV/div-5V/div in 9 steps or 10mV/div-10V/div in 10 steps. Horizontal deflection 4ns/div-1h/div in 38 steps. Input Coupling AC/DC/GND. X-Y mode, Storage depth 32kB~512kB/channel. Comprehensive range of trigger functions. Auto-set Measurement. Max. Input Voltage 35V DSO-2090 USB: Bandwidth 40MHz (-3dB), Max. Sampling Rate 100MS/s DSO-2150 USB: Bandwidth 60MHz (-3dB), Max. Sampling Rate 150MS/s DSO-2250 USB: Bandwidth 100MHz (-3dB), Max. Sampling Rate 250MS/s DSO-2500 USB: Bandwidth 200MHz (-3db), Max. Sampling Rate 500MS/s DSO-5200 USB: Bandwidth 200MHz (-3dB), Max. Sampling Rate 200MS/s, Equivalent Sampling Rate 50GS/s DSO-5200A USB: Bandwidth 200MHz (-3dB), Max. Sampling Rate 250MS/s, Equivalent Sampling Rate 50GS/s Small size(mm):190(L)x100(W)x40(H) , light weight: 380g , easy to carry.