Fitbit Charge HR Wireless Activity Wristband, Black, Large Type: Fitness Band Color: Black Features: Sizing: Small 5.5� - 6.7� / Large fits wrists 6.3� - 7.9� Water Resistance: Charge has been tested up to 1 ATM meaning it is sweat, rain and splash proof. However, the device is not swim proof. We also recommend taking Charge off before showering because, as with any wearable device, it’s best for your skin if the band stays dry and clean. Care: If band becomes wet, remove and completely dry before putting it back on. Clean the band with a mild soap-free cleanser like Cetaphil or Aquanil. Give your wrist a rest by taking the band off every now and then. Batteries & Power: Charge every few days to ensure can always be used Battery life: up to 7 - 10 days Battery type: Lithium-polymer Charge time: 1-2 hours Radio transceiver: Bluetooth low energy Environmental Requirements : Operating tem...
