Children'S Height Accuracy Measuring Instrument, Height Ruler, Wall Sticker, Automatic Height Measur The human body sensor automatic measurement feature is specifically designed for children: Easily measure your child's height even when they're alone. The growth monitoring and analysis app allows you to easily track your child's developmental progress. Measuring height: 0-2.5 meters Compatible with: FOR iOS/FOR Android Communication method: Bluetooth Battery capacity: 2000mAh Charging time: Approximately 6 hours Color: White Material: ABS Package Contents: 1 x height measuring robot Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.