This set was everything you needed to safely switch on your Brightdot projects or another electronic circuit.The set includes a battery pack for 3 x AA batteries with an onboard on/off switch and a connecting cable to connect to the portable development board. Give you an idea; this battery can run a portable development board and 10 sparkling Brightdot LEDs (not modules) at full brightness for more than 8 hours!To keep your portable project safe in the event of a short circuit, you can add the backup cards to the circuit. This card protects the batteries and thus prevents a fire hazard. Use the supplied connection cable to connect the backup card to the development board and they are all set. Remember, you can never be too sure with electronic kits.There are also some additional backups included if you have already included those on board the security card. For more information, see the features and specifications for more information.Be sure to read all our tips and tricks on Brightd