Works great (ad picture show inverter powered up was easiest way for me to show it working) connected to 12V battery. Battery, cables, and 120V tester shown in ad NOT included. Only the inverter (with user manual) is for sale Mobile Power Inverter converts 12 V DC power into 120V household AC power Simply connect to the 12V battery in your vehicle, a standalone 12V battery, or a bank of batteries to run AC powered devices Ideal for off-grid installations in cars, trucks, RVs, boats or at the cottage as well as emergency power during power outages Modified sine wave output form - compatible with most AC appliances 3x Standard North American AC outlets provide a total combined continuous running capacity of 3000W and 6000W surge capacity USB (2.1A) charging port for mobile electronic devices such as smartphones, tablets, and cameras Digital display allows you to monitor battery voltage (input), load wattage (output), and error/fault codes (for diagnosing system issues) Built-in protections include high and low voltage, overload, over-temperature, and short-circuit Includes wired remote (not shown in ad picture) Equipped with mounting brackets for a secure permanent installation