The Lascar Electronics EL-USB-5 stand-alone data logger offers versatile recording capabilities. It can log events by detecting inputs and storing the corresponding time and date. Additionally, the EL-USB-5 can record state changes, noting not only the detection but also when the input reverts to its original state. The data logger can also count events within a timed interval. It can record over 32,000 events or state changes, and in count mode, it can log over 32,000 timed intervals, with up to 65,000 counts per interval. Users can record up to 32,510 events or 32,510 state changes. Events and state changes can be triggered by either a rising edge (a voltage going from low to high) or falling edge (a voltage going from high to low). It is also possible to use volt free contacts. Instead of measuring an external voltage, the data logger applies a voltage across the screw terminals and detects when the input closes. Fast logging rates allow event capturing at speeds of up to two times per second and state changes at speeds of up to five times per second. Event counting can operate at speeds of up to 100 times per second (when the LEDs are turned off). The user can easily set up the logger and download the stored data by plugging the data logger into their PC's USB port and running the EasyLog software that is compatible with Windows 98 through current generations. Data can then be graphed, printed and exported to other applications. The ELUSB5 is supplied with software, measurement leads terminated with crocodile clips and a long-lasting lithium battery which lasts up to 1 year depending on usage patterns. Functionality of the unit is indicated by flashing red and green LEDs, with an option to flash the red LED every time an event occurs