[Prime] U8 Bluetooth V4.0 Bluetooth Wrist Smart Watch WristWatch UWatch for IOS Android iPhone 4/4S/5/5C/5S Samsung S2/S3/S4/Note 2/Note 3 HTC Sony Blackberry,Red Bluetooth Version: Bluetooth V4.0; Charging Time: about 1 hour;Music Play Time: about 6 hours;Standby Time: about 160 hours Ambient Noise: 75dB;Transmitting Range: 10m;Range of Frequency: 2.4GHz spectrum Bluetooth Protocol: A2DP + HFP 1.5 + HS P 1.2;Power Supply: Built-in 230mAh rechargeable battery Language Support : English, French, German, Russian, Italian,Spainish,Portuguese, Polish, Dutch, Turkish, Arabic,Thailand, Viet Nam