Green Lion Infinite Smart Watch Black. Green Lion is a new smartwatch that works with your phone to make your life easier. With its apps, email and messaging are within reach, even when you’re not near your phone. The watch has the capability to stand by for a period of 25 days which makes it hugely convenient for traveling. The 1.32′ HD touchscreen allows you to check your notifications clearly and attend to them. You can wear your Green Lion watch at any time owing thanks to its waterproof nature which can be worn in the shower or while swimming as well. The heart rate sensor embedded in the smartwatch will start your heart rate during exercise.