Fitbit Wireless Activity Smart Bracelet Features: The first smart bracelet with OLED, recording sports data in daytime And sleeping data at night to guide healthy living lifestyle. Host comes with a standard USB port, special design to charge Through connecting PC and mobile driver. Computers and Android dual-mode synchronous data. Host Syncs via wireless Bluetooth also PC via USB Designed with IP67 for good waterproof performance. Using led lights and vibration motor to remind twice. Pedometers Basic pedometers Weight: 18g (unpacked) Three rate IP67 Work temperature: Operating temperature Hardware Specifications Charge method: Standard USB charging Display Size 0.49 & 0.91 inch OLED screen Battery : 40mAh polymer battery Standby time: over 4days Synchronized with the following devices PC terminal: Windows XP, Vista.7+ Mobile terminal : iphone4/5/5s, ipod touch5 , ipod 3etc,ios6.0 Above and some android 4.2 Bluetooth 4.0+ smart phones to Synchronize data Equipment list : Host wristband snaps manual Service commitment Returning for 7 days , 15 days replacement