Features: 1. Using high-quality chips, stable performance. 2. Built-in 220mA lithium battery, which can last for 50 hours. the 3. Specially equipped with Micro USB cable for charging, charging for about 4 hours. 4. Sleep function, if no operation is performed, the keyboard will automatically enter power saving mode within 15 minutes. 5. 59 button design, with 14 iPad shortcut function keys. 6. The buttons are screen-printed with UV peritoneal treatment, durable, and the color will not fade after 5 million times of friction and knocking. 7. The surface of the keyboard is brushed, which is very textured and very high-grade. 8. Scissor key design, sensitive typing, fast response, good hand feeling. 9. Size: 248mmx150mmx4mm 10. Weight: 450g the parameter: 1. Modulation mode: GFSK 2. Working voltage: 1.8-3.6V 3. Charging time: 4 hours 4. Lithium battery capacity: 220 mA 5. Lithium battery life: 3 years 6. Standby time: 30 days