... 2cmNet Weight:13.5gLife of battery:used 3 yearsMaterial:environment silicone, nontoxic and tasteless.colour:can make red, yellow, ... and women, beauty and fashion, nontoxic and tasteless, durable, use it so many times and unmodification. Silicone energy balance watch ... and women, beauty and fashion, nontoxic and tasteless, durable, use it so many times and unmodification. Silicone energy balance watch ...