ANCwear Bluetooth Smart Watch WristWatch U8 UWatch Fit for Smartphones IOS Apple iphone 4/4S/5/5C/5S Android Samsung S2/S3/S4/Note 2/Note 3 HTC Sony Blackberry (White) by ENKE-smart Sports Fitness Watch - Various health tracking app designed to monitoring the situation of your sleeping,walking(Accelerometer,Passometer) Bluetooth Smart watch - Android System can support all functions in the description, BUT for Iphone IOS can only support:Passometer,Calendar,Call Sync,Calculator,Clock,Stopwatch. HD Display Screen Watch- 1.48" TFT LCD Touch Screen to save the power,full charging the 230mAh rechargeable battery take about 1 hour ,could support 3-hour phone call,6-hour music play,stand by 160 hours. Hands-free Speaker Phone  - Answer or dial calls from your wrist, with ringing reminder when you receive a call. Wide Application on Smartphones  - This smart watch is completely compatible with Andriod smartphone(4.2 and Above) through Bluetooth(version 3.0),including SAMSUNG galaxy s4/s5/s6/s7 Edge Note 3/4/5 HTC NEXUS SONY LG HUAWEI ZTE ONEPLUS etc, just need to install an APP and open the Bluetooth on your smartphone. But for Apple Phones, Bluetooth connection used for Phone calls only.