[. . . ] This document is a brief guide, which illustrates RL811 main features and functions. Power Supply Installing and replacing batteries: RL811 works with 1 AAA battery (not included). [. . . ] Press the [SET] key to confirm and use the [ADJUST] key to set the hour of the alarm. Press the [SET] key to confirm and use the [ADJUST] key to set minutes. Press the [SET] key to confirm and press it repetitively to return to the time display mode. When the alarm rings, press the [SET] / [ADJUST] key to turn off the alarm. Time and day setting Press the [Set] key four times to enter the time and date setting. If you wish to select the 12 hour setting (A/P) or the 24 hour setting (H) continue pressing the [ADJUST] key until you reach the desired time. Press the [SET] key to confirm your hour settings and use the [ADJUST] key to set the minutes. Press the [SET] key to exit setting mode and return to time display mode. Maintenance Clean the unit with a soft damp cloth; do not use any detergent product. Never immerse in water and protect from rain and extreme temperatures. [. . . ] To make use of the warranty or the after-sales service, please contact your retailer and supply proof of purchase. Our warranty covers material or installation-related defects attributable to the manufacturer, with the exception of wear caused by failure to respect the instructions for use or any unauthorised work on the equipment (such as dismantling, exposure to heat or damp, etc. [. . . ]