Dual-Satellite Sync: Automatically receives GPS/BeiDou signals. Adaptive Brightness: Auto-dimming for day/night viewing. Triple Alarm System: settings for 3 alarms. Large Display: 2.3-inch high-visibility LED digits. Multi-Function Display: Time/Date Power Supply:USB Type-C 5V DC (ports on back/right side) Operating Current:200mA. Sync Range:2m from window recommended Display Modes:Time only / Date only / Alternating cycle Dimensions:Not specified (display size: 2.3 inch) Functional Operation: SET Button Enters setting mode (YearMonthDateHourMinuteSecond) Flashing values adjusted with +/- buttons Note: Satellite sync eliminates manual adjustments + Button Cycles display modes: dP:0 Continuous time display dP:1 Continuous date display dP:2 Time/Date alternating - Button (Advanced Settings) Code Function Range LP Brightness Level 1 (dim) to 8 (bright) AL Auto-Brightness 0=Off / 1=On BP Alarm Sound 0=Mute / 1=Enable EE Time Zone 8=Beijing Time (GMT+8) FF Time Format 12=12-hour / 24=24-hour ALARM Button Sets 3 alarms (indicated by -1-, -2-, -3-) Pro Tip: Set all alarms to same time for single daily alarm 30-second duration ( any key to snooze) Usage Notes Placement: Position 2m from window for satellite reception Brightness: Manual adjustment (LP) requires AL=0 setting Time Zone: Effective after successful satellite sync (SYNC LED active) Alarm: Audible alert requires BP=1 setting Key Advantages -grade precision - Maintains millisecond accuracy via satellite Smart light sensing - Eliminates nighttime glare Global compatibility - Works with GPS (worldwide) and BeiDou (Asia-Pacific) Zero-configuration - Fully automatic time synchronization Color: Black Material: plastic Package Contents: 1 x GPS Clock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.