It is generally acknowledged that average smartwatches usually have a short battery life, while this is not the case in smart wrist bands as they feature smaller displays and have next to none hardware requirements.
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<br />The LYNWO M4 Health Smart band that comes to the scene features all the intriguing functions we see on other bands but it has a character of its own - blood pressure measurement designed for those looking for bells and whistles in functionality.
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<br />What you do during the day affects your rest and recovery at night. With M4, you get the personal insights you need to make quality sleep a habit. M4 embeds the most accurate sleep tracker to record the bits and pieces of your night sleep for a continuous 7 days, so you will keep informed about whats happening during the night.
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<br />As for the rest, a dynamic heart rate monitor is added along with the activity recorder (steps, calories, distance), sleep monitor, plus an alarm clock to remind you of the preset schedules. Instead of having to estimate your activity level on your own, LYNWO M4 does the heavy lifting for you once and for all.
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<br />Faced with the the splash-proof design from competitors, LYNWO brings to the table IP67 standard M4, meaning that you could wear this fitness band in rainy weather, and clean it following a workout.
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<br />Where the wrist band splits the right and left to the buckle, there is a big 0.86 OLED display that allows for switching between portrait and landscape. It has its own smartphone app named H Band to which it connects via Bluetooth 4.0 either on Android 4.3+ or iOS 7 and above. Lastly, you can receive calls and social apps notifications as well.
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<br /> Specification
<br />General t
<br />Model: LYNWO M4
<br />Material: ABS+ PC case, TPU band
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<br />Specifications t
<br />Display Size: 0.86 Inch OLED screen,96*32dbi
<br />Processor: Nordic51822 (lowest power Bluetooth chip)
<br />Senser: 3-axis accelerometer
<br />Operation: Touch
<br />NFC: Support
<br />Motor: Support
<br />Motion: Support
<br />Compatible: Compatible with Smart phones of Android 4.3 and above/iOS 7.0 and above,Bluetooth4.0 
<br />Language: Chinese, English, Japanese, Korean, German,Russian, Spanish,Italian,French,Vietnamese
<br />Bluetooth: Bluetooth 4.0
<br />Antenna: Ceramic antenna
<br />Battery: 180mAh  Li-polymer battery
<br />Standby: 8 days
<br />Waterproof level: IP67
<br />APP: H Band
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<br />Dimensions&Weight (Main Product) t
<br /> Dimensions: 46.3mm*18mm*13.4mm
<br /> Net Weight: 20g (Including battery)
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<br />Package Contents
<br /> 1*Smart Bracelet
<br /> 1*Charging dock
<br /> 1*Manual