Features: Real-time posture assessment trains your body to take up an upright posture naturally. With better body awareness, you can break harmful stretching habits.Good posture can help you stay cool. Upright posture boosts testosterone production and lowers cortisol levels in your body and brain, leaving you feeling ready for any challenge. Specification: Product material: nylon belt, ABS Product weight: 85g Working voltage: 5V Rated power: 0.4W Charging time: About 2 hours Product battery: 500mAh lithium polymer battery/3.7V Applicable population: children/adults for men and women Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you