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Brand
Other names

Shouhuan 4, Mi Smart Band 4

Mi Band 4C

Amazfit Band 2, Midong Band 2

Midong Band, Amazfit Band

Hey+ 1S NFC

Hey+, Hey Plus Band, Black Plus

Release date

June 2022

June 2020

june 2019

April 2020

2018

2018

2018

2016

September 2019

August 2018

2017

2016

2016

What is it

smart bracelet

Activity bracelet

Smart bracelet

Activity bracelet

Activity bracelet

Activity bracelet

Activity bracelet

Activity bracelet

Sports bracelet

Activity bracelet

Activity bracelet

Activity bracelet

Activity bracelet

Medidas

46.5 x 20.7 x 12.25 mm

Peso

13.5 g

Material

TPU

ABS, TPU, PC, Tempered glass

Polycarbonate

PC, Glass and TPU

Plastic

TPU, polycarbonate

Stainless steel, polycarbonate

Plastic, aluminum alloy

Plastic alloy, silicone

Plastic alloy, silicone

Aluminum, Polycarbonate

Stainless steel, TPU, ceramic

Stainless steel, TPU, ceramic

Pantalla / Resolución

AMOLED 1.62" / 192 x 490

Batería

180 mAh

Duración Batería Max / Min

14 días

Modos deportivos

110

Grado de impermeabilidad

5 ATM

Conectividad

Bluetooth 5.2 BLE

Sensores

Sensor de 6 ejes de alta precisión y sensor de frecuencia cardiaca PPG: Acelerómetro de 3 ejes de bajo consumo y giroscopio de 3 ejes Sensor de frecuencia cardiaca PPG

Colores

Marfil, Oliva, Naranja, Azul, Negro, Rosa, Verde Neón, Naranja Neón, Verde Caqui, Azul Caqui

Compatibilidad

Android 6.0 / iOS 10.0

Dimensions

47.2 x 18.5 x 12.4 mm

21.6 x 10.8 mm

58.69 x 20.72 x 16.52 mm

17.9 x 46.9 x 12 mm

40 x 19 x 10 mm

40 x 19 x 10 mm

40.3 x 15.7 x 10.5 mm

44.85 × 18.2 × 10.8 mm

225 x 15.7 x 10.5 mm

24.8 x 19 x 11 mm

65 x 65 x 5.8 mm

65 x 65 x 5.8 mm

Weight

11.9 g
12.1 g (NFC)

22.1 g

13 g

20 g

32 g

32 g

7 g

19.7 g

19.7 g

20 g

15 g

15 g

Screen / Resolution

AMOLED 1.1" / 126 x 294

AMOLED 0.95" / 120 x 240

TFT + TP 1.08" / 128 x 220

AMOLED 0.78" / 180 x 80

IPS LCD 1.23"

IPS LCD1.23" / 80 x 160

OLED 0.42" / 128 x 80

AMOLED 0.95" / 120 x 240

AMOLED 0.95" / 120 x 240

OLED 0.42" / 72 x 40

-

Battery

125 mAh

135 mAh LiPo

130 mAh

110mAh LiPo

160mAh LiPo

170 mAh LiPo

70 mAh LiPo

120mAh LiPo

120mAh LiPo

70 mAh LiPo

15 mAh

15 mAh

Battery life (Max / Min)

20 days / 14 days

20 days

14 days

20 days

20 days

20 days

10 days

Sports modes

11

6

5

-

4

-

-

Waterproofing grade

5 ATM

5 ATM

5 ATM

5 ATM

5 ATM

5 ATM

IP67

5 ATM

5 ATM

IP67

IP68

IP68

Conectivity

Bluetooth 5.0 BLE

Sensors

Six-axis sensor: low-powered 3-axis acceleration sensor + 3-axis gyro PPG heart rate sensor; digital silicon microphone (only compatible with NFC version)

3-axis accelerometer + 3-axis gyroscope; PPG heart rate sensor; capacitive proximity sensor

3-axis accelerometer; heart rate sensor PPG

Triaxial acceleration, heart rate sensor PPG

Tri-axial acceleration sensor, PPG heart rate sensor, Capacitive wear sensor

Triaxial acceleration, PPG heart rate sensor

Low Power Acceleration Sensor, Photoelectric Heart Rate Sensor

Tri-axial accelerometer, PPG sensor

Tri-axial accelerometer, PPG sensor

Optical heart rate sensor (PPG), accelerometer

ADI

ADI

Color

Black (more colors in bracelets)

RAM

512 KB

512KB

512 KB

-

-

-

-

-

-

ROM

16 MB

16MB

8 MB

-

-

-

-

-

-

Compatibility

Android 5.0 / iOS 10.0

Android 4.4, iOS 9

Android 4.4, iOS 10

Android 4.4, iOS 9

Android 4.4 / iOS 8

Android 4.4 / iOS 8

Android 4.4, iOS 8

Android 4.4, iOS 8

Android 4.4, iOS 8

Android, iOS

Android, iOS

Android, iOS

Strap width

18 mm

12mm

12 mm

12 mm

12 mm

-

-

Connectivity

Bluetooth 5.0 BLE

Bluetooth 5.0 BLE

Bluetooth 4.2 BLE

Bluetooth 4.2 BLE

Bluetooth 4.0 BLE

Bluetooth 4.0 BLE

Bluetooth 4.2

Bluetooth 4.2

Bluetooth 4.0

Bluetooth 4.0

Bluetooth 4.0

Colours

Black

Black, red, green, green and blue straps

Black, multi-colored bracelets

Black

Black

White, Black

Battery duration (max/min)

12 days

10 days

Sport modes

4

-

Colors

Lime Green, Blue, Dark Blue, Black, Red, Grey

Black, strap in various colors

Black

Black

Black, White

Battery life (max/min)

20 days

18 days

Battery life (max/min)

18 days

Description

This may be one of the categories of devices most demanded by users. Undoubtedly since Xiaomi and its subsidiaries have entered the market for activity and monitoring wristbands, this market has boomed. We are not going to discuss here which one is better or more recommended, but, as usual, list the characteristics that are most common to this type of device so that each user can choose -with all the information available- the one that best suits their needs.

As it does not happen in watches, these bracelets are usually made of less resistant plastic materials, which is reflected in their price. However, the author writes this article in October 2019 with a Mi Band 2 on his wrist bought since its launch… So this does not mean that the materials are bad. Anyway, there is a difference in quality between watches and bracelets. A bracelet will always be much more ergonomic and small, less annoying in general.

The screens are also always smaller and sometimes black and white. This has a direct impact on energy management and therefore battery life. These bracelets are often used to quantify the sport that can be done with them, so the most normal thing will be that they are used outdoors. It is important that the screen can be displayed correctly under these conditions. The battery is usually an important aspect and a very positive one. To improve energy management we can cancel the automatic heart rate monitoring that most bracelets come by default, as well as put notifications or alarms to a minimum. Of course, the charger is almost always proprietary, so it should not be lost.

Impermeability is a very important feature. It is normal that when we are doing sports we sweat or get dusty or dirty, and it would not be pleasant for the bracelet to be damaged by this type of thing. Therefore, unless we are going to go to the beach or the pool with it, it will not be necessary for it to withstand 5 atmospheres of pressure, for example. But it will be recommended that it has a minimum IP67 certification.