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Product information : Material: Alloy Battery capacity: 280mah Product weight: 180G Body memory: 64kb Wearing method: wristband Operation mode: touch + button Interface: USB 2.0 Wireless distance: 5m (inclusive)-10m (inclusive) Function: heart rate monitoring Color: black steel, silver steel, gold and silver edge steel strip, gold steel, black leather, silver leather, gold shell black leather, brown leather Packing list: Bare metal*1 Manual*1 Data cable*1 Packing box*1