Longines ULTRA-CHRON (L2.836.4.52.6, L2.836.4.52.2) Manual

Precautions concerning water-resistance

A watch's water-resistance can be affected by changes caused by the gaskets drying out, or an accidental shock to the crown. To help maintain your watch's water-resistance, we recommend rinsing it in soft water after any contact with sea water and having its water-resistance checked once a year by an approved LONGINES Service Centre. In no circumstances should you open your watch yourself.

Never activate the time-setting crown and/or push-pieces when the watch is underwater, and ensure that the crown and push-pieces are pushed in or screwed down before any immersion in water.

Marking on the case-back	Meaning *
None	Not water-resistant
3 bar	Water-resistant up to an overpressure of 3 bar (30 m)*
5 bar	Water-resistant up to an overpressure of 5 bar (50 m)*
10 bar	Water-resistant up to an overpressure of 10 bar (100 m)*
30 bar	Water-resistant up to an overpressure of 30 bar (300 m)*

SETTING THE TIME – GENERAL INFORMATION

1. Crown
2. Hour hand
3. Minute hand

Hour and minute display.

Screw-in crown
Some LONGINES models are fitted with a screw-in crown which must be unscrewed before setting the time or winding the watch, by turning anti-clockwise. After setting the time or winding, return the crown to position 1, then push it back in and screw it in firmly in order to ensure the watch's water-resistance.

Setting the time
Pull the crown out to position 2 and turn it forwards or backwards until the desired time is displayed. Once the time is correctly set, push the crown back in to position 1.
If you have not worn your mechanical watch, manual winding (30 or so turns) is necessary.

• INGESTION HAZARD: This product contains a button cell or coin battery.
• DEATH or serious injury can occur if ingested.
• A swallowed button cell or coin battery can cause Internal Chemical Burns in as little as 2 hours.
• KEEP new and used batteries OUT OF REACH OF CHILDREN
• Seek immediate medical attention if a battery is suspected to be swallowed or inserted inside any part of the body.

Remove and immediately recycle or dispose of used batteries according to local regulations and keep away from children. Do NOT dispose of batteries in household trash or incinerate.
Even used batteries may cause severe injury or death.
Call a local poison control center for treatment information.
Battery type and nominal voltage: 317-321-335-346-364-371-373-377-379/1.55 V.
Non-rechargeable batteries are not to be recharged.
Do not force discharge, recharge, disassemble, heat above (manufacturer's specified temperature rating) or incinerate. Doing so may result in injury due to venting, leakage or explosion resulting in chemical burns.
This product contains a battery that is not intended to be replaceable by the user.