KK70 New Breathing training Smart Bracelet ,Multi-sport mode BT Waterproof Round Smart Watch Wholesale DT70 Product modeling:Intelligent Watch Craftsmanship:Zinc alloy+IML Product weight:35g Total length of wristband:260mm Wristband material:Silicone, leather, steel Life time:Normal use 4-5 days, standby 10-15 days. (Actual use time depends on personal use) Charging method:Wireless charge Charging time:Around 3 h Color of Strap:Black for siicone, brown and black for leather