What is xiaomi mi band 1s with heart rate sensor?

The Xiaomi Mi Band 1S is a wearable fitness tracker that was released in November 2015. It's the successor to the original Xiaomi Mi Band and features several improvements, including a heart rate sensor, which allows users to monitor their heart rate throughout the day.

The device is made of silicone and has a removable and adjustable wristband. It features a 0.42-inch OLED display, which shows the time, steps taken, distance traveled, and calories burned. The Mi Band 1S can also monitor sleep patterns and has a vibration alarm to wake up the user.

The heart rate sensor on the Mi Band 1S uses optical technology, measuring blood flow beneath the skin. Users can check their heart rate in real-time through the Mi Fit app, available on Android and iOS devices. Other features of the app include tracking of daily activities, setting fitness goals, and social media integration.

The Mi Band 1S is compatible with a range of devices, including smartphones and tablets running Android 4.4 and up, and iOS 7.0 and up. The device has a battery life of up to 30 days on a single charge and is water-resistant up to a depth of 50 meters.

Overall, the Xiaomi Mi Band 1S is a feature-packed, affordable, and reliable fitness tracker, particularly for individuals looking to monitor their heart rate.