The RetroFit Mailbox Light is a motion censored bright LED light that is extremely easy to install. It emits a bright warm white color which lights up the whole inside of the mailbox. It automatically turns on upon sensing motion within the mailbox and automatically shuts off after 15 seconds. It only turns on in the dark so if it detects it is daylight it will not turn on and waste battery! Product uses 4 AAA batteries. An adhesive strip is used to adhere the metal strip to the mailbox which then the light attaches to. This allows for easy removal if batteries need to be replaced and simply reattach it to the magnetic strip!