1. Product Overview
The LN LENQIN 0550A is a quartz analog watch designed for men, featuring a classic military style with a 42mm dial, 12/24 hour time display, and a date function. It is constructed with a durable stainless steel case and a comfortable leather band. The watch is equipped with a high-quality quartz movement for accurate timekeeping and a high-hardness mineral glass dial window for wear and scratch resistance.
Key Features:
- Military Style Design: 42mm dial with 12/24 hour time and date display.
- Accurate Quartz Movement: Ensures precise timekeeping.
- Durable Construction: Stainless steel case and high-hardness mineral glass.
- Luminous Hands and Markers: For enhanced readability in low-light conditions.
- 3ATM Water Resistance: Suitable for daily splashes, rain, and handwashing.
- Comfortable Leather Band: Designed for extended wear.

Figure 1: Front view of the LN LENQIN 0550A watch, showcasing the dial and leather strap.

Figure 2: Rear view of the watch, showing the stainless steel case back with model number and water resistance rating.
2. Setup and Initial Use
Setting the Time:
- Gently pull the crown (located on the right side of the watch case) out to the second click position.
- Rotate the crown clockwise or counter-clockwise to adjust the hour and minute hands to the correct time.
- Once the time is set, push the crown back in to its original position to start the watch movement.
Setting the Date:
- Gently pull the crown out to the first click position.
- Rotate the crown to adjust the date display.
- Once the date is set, push the crown back in to its original position.
Note: If the watch is not functioning upon arrival, ensure any small plastic stoppers or protectors around the crown have been removed. These are often used to preserve battery life during shipping.

Figure 3: Illustration of a hand adjusting the watch crown to set time or date.
3. Operating Instructions
Luminous Display:
The watch features luminous hands and markers that absorb light during the day and glow in the dark, allowing for easy time reading in low-light conditions. The intensity and duration of the glow depend on the amount and intensity of light exposure.

Figure 4: The watch dial with luminous hands and markers visible in a dark environment.
Water Resistance (3ATM):
This watch is rated for 3ATM (30 meters) water resistance. This means it is suitable for daily use and can withstand splashes, rain, and handwashing. It is not designed for prolonged water exposure.
- Suitable for: Rain, handwashing, accidental splashes.
- Not suitable for: Swimming, bathing, diving, showering with hot water, or any activity involving submersion or high-pressure water.
Important: Do not operate the crown or pushers while the watch is wet or submerged, as this can compromise the water resistance.

Figure 5: The watch being worn during handwashing, demonstrating its 3ATM water resistance.
4. Care and Maintenance
General Care:
- Clean the watch case and crystal regularly with a soft, dry cloth to remove dust and smudges.
- Avoid exposing the watch to extreme temperatures, direct sunlight for prolonged periods, or strong magnetic fields.
- If the watch comes into contact with saltwater, rinse it gently with fresh water and dry thoroughly.
Leather Strap Care:
- Avoid prolonged exposure of the leather strap to water, sweat, and direct sunlight to prevent discoloration and damage.
- Clean the leather strap with a soft, damp cloth and mild soap if necessary, then dry it completely.
- Condition the leather periodically with a suitable leather conditioner to maintain its flexibility and appearance.

Figure 6: Detailed view of the leather strap, highlighting its texture and stitching.
5. Troubleshooting
Watch Not Functioning Initially:
If the watch hands are not moving upon receipt, check if a small plastic stopper is inserted under the crown. This stopper is used to save battery life during shipping. Remove it by gently pulling the crown out and then pushing it back in to start the watch.
Date Display Readability:
The date display window is compact. Ensure adequate lighting when checking the date for optimal visibility.
6. Product Specifications
| Feature | Specification |
|---|---|
| Item Model Number | 0550A |
| Movement Type | Quartz Analog |
| Case Diameter | 42mm (1.65 inches) |
| Case Thickness | 12mm (0.47 inches) |
| Band Material | Leather |
| Band Width | 20mm (0.79 inches) |
| Band Length | 245mm (9.64 inches) |
| Wearing Range | 175-225mm (7-8.85 inches) |
| Clasp Type | Buckle |
| Water Resistance | 3ATM (30 Meters) |
| Dial Window Material | High-hardness Mineral Glass |

Figure 7: Visual representation of the watch's key dimensions and parameters.
7. Warranty and Customer Support
Warranty Information:
Please refer to the product packaging or the official LN LENQIN website for specific warranty details and terms.
Contact Support:
For any questions or assistance regarding your LN LENQIN watch, please contact our customer service team. We provide 24-hour customer service to address your inquiries.
Contact details can typically be found on the product packaging, the seller's page on the platform where the watch was purchased, or the official brand website.