LED Display 12/24 Hour Display 3-Level Brightness Adjustment Material: ABS Product Color: White Input Voltage: USB 5V/1A Size: 15*7*4 cm (square) Battery: CR2032 x 1 (included), AAA batteries x 4 (sold separately) Package Contents: 1x Wooden LED Alarm Clock 1x User Manual 1x Power Cable Quick Manual (1) Display Mode Selection: DP-1/DP-2 Press "SET" to switch between DP1/DP2. (2) Sound Control Mode Selection (for power-saving mode with AAA batteries). Press "DOWN", "on:SD" → "-:SD:", "on:SD" means sound control is active, "-:SD*" means sound control is off. (3) Press "UP" to switch between °C and °F formats. (4) Press and hold the "SET" button for 3 seconds to enter setting mode. Settings: Year - Month - Date - 12H/24H - Hour - Minute - ALA1 (Alarm) - ALA2 - ALA3 - E (Workday) - Brightness Adjustment On/Off, adjusted with "UP" and "DOWN". When the year symbol flashes. (5) Display Brightness Adjustment. Press and hold the "UP" key for 3 seconds, "L1" (normal brightness) will be displayed. Press "DOWN" key, "L2" (medium brightness) will be displayed. Press "DOWN" key, "L3" (lowest brightness) will be displayed. Press "UP" key, the brightness will be enhanced. The setting will be automatically saved and exited after 3 seconds.