If you are looking for similar product like smartwatch or to be precise smart wristband then you should definitely consider these offer from Chinese shop Gearbest. Because they have now on sale X9 Plus BLE which costs only $19,99.
But of course you are curious what kind of functions and features offers this smart wristband. So for example it has 0.95 inch OLED screen with resolution 128 x 64 pixels. On that screen it can show you all useful information like information which are acquired with sensors.
Therefore X9 Plus BLE has functions like heart rate monitor, blood pressure, blood oxygen and call remind. But what is most interesting that this smart wristband is waterproof because it has IP rating: IP67.
It comes with built-in battery with capacity of 100 mAh, and it offers approximately 7 days of autonomy. It can work almost with any device with Bluetooth connection, and it is compatible withAndroid 4.3 / iOS 7.0 and above systems.
So if you like this smart wristband then you can buy it now at Gearbest here.