20 mm

This device was used consistently for eight months. I was recently gifted a new one, so I no longer need this current unit. It remains in excellent condition, showing no signs of wear or tear, and functions like new. It has never been dropped or exposed to water. The item includes its original packaging, a charging cable, and four new, unworn interchangeable bands—two made of silicone and two crafted from a stretchy fabric. While there is no user guide included, detailed instructions can easily be found online.