Multiple Choice: Black, Cyan, Blue, Red, Orange, Lavender; There are different popular colors available for you to choose, personalize your Tracker to fit your mood and outfit in daily life, even at any time (it came with 3 pack with different color).Flexible: Durable and soft silicone across your wrist, improves comfort, bring your kid a comfortable and lightweigth wearing experience. The design of 'All-in-one Silicon Stretchy' without traditional metal buckle is better for kids, let them more feel free to play and don't worry about the watch falling accidentally cause in the metal buckle.Optional Wristband Size: Small size for 4.7'-5.7'(120-145mm), Large size for 5.7'-6.5'(145-165mm). The design of wristband is ergonomic. Please kindly check and measure the circumference of your kid wrist in detail to purchase the suitable band. It is made of environment-friendly non-toxic medical Silica Gel, with good water and dust proof functions and can be applied to both adults and children.Easy to Install and Waterproof: Take out the dial, insert one end of the dial, then stretch the band and press the other end in. No extra tools needed. Never rip or break before shipment.