Zeacool 5ATM Fitness Tracker

A 5ATM rating means the case is tested to withstand pressure equal to about 50 metres of still water. In practice that covers the activities most people do in water:

• Swimming lengths in a pool or calm open water.
• Showers and baths at normal temperatures.
• Hand washing, dishes and heavy rain without a second thought.

It is not a diving rating. Scuba, high diving and fast water sports like jet-skiing put far more pressure on seals than a steady swim, so the band should come off for those.

Out of the water it is a full fitness band. A 1.1-inch AMOLED touchscreen shows steps, heart rate and time in bright, sharp digits on a black background. The Bordeaux strap gives it a warmer look than the usual black band, and a choice of watch faces changes the style from sporty to smart.

Incoming calls, SMS and alerts from Facebook, LinkedIn and Instagram buzz the wrist, though calls are answered on the phone.

Choose swimming from your shortlist before getting in, and the session sits in the weekly log next to your runs and walks.

The Zeacool monitors heart rate continuously for 24 hours a day, and adds blood oxygen, blood pressure and temperature readings. Each night it logs when you drop off and wake, how the hours divide between light and deep sleep, and a quality verdict waiting in the app at breakfast.

Ways to use two weeks of data:

1. Compare weekdays and weekends. A later Saturday bedtime often shows up as lighter sleep and a higher resting heart rate.
2. Watch your resting heart rate. A steady fall over weeks of regular exercise is a classic sign of rising fitness.
3. Track temperature trends alongside the cycle predictions, since both shift across the month.
4. Use the vibrating alarm to wake at the same time daily, which steadies the sleep pattern.

The women's health section predicts periods and ovulation. Sedentary and water reminders keep the working day moving, and a morning weather readout helps plan the day's workout.

• Active minutes are counted separately from steps.
• The remote camera fires the phone's shutter.
• Find phone rings a lost handset.

None of the readings are medical; the band is not a medical device. Use it to notice patterns and bring anything persistent to a doctor.

The charger guide covers spare magnetic cables for when the original goes missing on a trip.

1. Charge the band until it switches on.
2. Get Keep Health on your phone from its app store.
3. Turn on Bluetooth, create an account and log in.
4. Tap Add a Device and pick the entry that begins C60.
5. Enter your personal details so steps, distance and calories are measured more accurately.

With the band linked, open the sports list. Keep Health offers 25 modes, and you can pick any number of them as your own shortlist on the band, perhaps swimming, walking, running and cycling for a triathlon-style week.

Routes are drawn from the phone's GPS, so carry the phone on outdoor runs and rides if you want the map in the app. In the pool, the band records the session on its own.

If alerts go missing

• Check that notification alerts are switched on under the device's notification settings in Keep Health.
• Look at the do-not-disturb schedule, which blocks alerts during its hours.
• On Android, exempt Keep Health from battery optimisation so it keeps running.

The band takes the time from the phone at each sync. For deeper pairing problems, the connection guide walks through a full reset and re-pair.

Once the shortlist is set, starting a swim or a run takes two taps on the band.

The Moremore band is the same C60 design in black, with a nightly sleep score and a family view in the app. The Runlio T115 keeps 5ATM on a larger 1.47-inch screen for easier reading. The Enfit IDB05 uses a 3ATM rating, fine for splashes and showers but less suited to regular laps.

Check these before choosing the Zeacool:

• Calls: alerts only, no speaker.
• Screen: 1.1 inches suits glances rather than reading long texts.
• Apple Health: no link; your history lives in Keep Health.
• Diving: 5ATM is for swimming, not scuba.

Screen size and water rating pull in different directions here. A bigger 1.47-inch face is easier to read at the poolside clock, while the 1.1-inch pod is lighter and less likely to catch on a sleeve or a wetsuit cuff. If you mainly swim and sleep in it, the smaller band tends to win; if you read messages on it all day, the larger face earns its space.

Battery is the Zeacool's other edge. It quotes 10 to 14 days of regular use against up to 7 for the Moremore, so a two-week holiday can go by without packing a cable.

For a swimmer who wants one band for pool, office and bed, the Zeacool covers all three and charges only twice a month. More on swim ratings sits in the FitPro smart watch review.