How to Identify USB Version Under Linux Nov 23rd 2021 Words: 340 
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lsusb

Bus 006 Device 002: ID 05e3:0626 Genesys Logic, Inc. USB3.1 Hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 010: ID 058f:6387 Alcor Micro Corp. Flash Drive
Bus 005 Device 003: ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Flash Drive
Bus 005 Device 002: ID 05e3:0610 Genesys Logic, Inc. Hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 019: ID 1532:0083 Razer USA, Ltd RC30-0315, Gaming Mouse [Basilisk X HyperSpeed]
Bus 001 Device 018: ID 24ae:4018 Shenzhen Rapoo Technology Co., Ltd. Rapoo Gaming Keyboard
Bus 001 Device 017: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Take down the bus and device number of the device

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lsusb -D /dev/bus/usb/005/003

Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x090c Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.)
  idProduct          0x1000 Flash Drive
  bcdDevice           11.00
  iManufacturer           1 Generic
  iProduct                2 Teclast CoolFlash
  iSerial                 3 CCYYMMDDHHmmSSK58XOQ
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0020
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval             255
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval             255

The bcdUSB 2.00 suggests the pen drive is USB 2.0