Brainboxes us series usb to serial adaptors brainboxes us 159 tough ultra small isolated usb to serial adapter suitable for any environment the closest you can get to an integrated serial port high retention usb connector for an unbreakable connection avoid electrical damage to your expensive equipment with isolation brainboxes us 159 is fully compliant with iec 61000 4 2 meaning your equipment is immune to electrostatic discharge up to 8kv of contact discharge or 15kv of air discharges