Compatibility: requires Android 4.4 or above, iOS 7.0 or above,Bluetooth 4.0 or above. download APP "Zeroner" from Apple Store or Google Play.
OLED Display: 0.91 inch OLED screen allow you to check time, date, steps, calories, working distance, message, caller ID freely
Multi Functions: tracks steps, walking distance, calories burnt, sleep quality. Also can be set alarm to remind of getting up, drinking or sedentariness
If you have any question with the item,please write to the email:firstname.lastname@example.org,we will reply with 12 hours solve question with 24 hours
We promise:30 days return and exchange,12 month warrantly.so please be secure to purchase.