Product features: - Durable aluminum ally materials; - Scissors feet design feels comfortable and with long life time; - Multimedia key: Yes - Ergonomic design: Yes - Connection method: Wireless - Continuously work for 90 hours automatically enter into sleep mode when non-use after 15 minutes - Providing adequate protection of 90 ultra-long standby time during business work or trip - Operation distance: 10m - Keys: 66 - Supports laptop tablet PC cell phone with Bluetooth function - Charging time: 3~4 hours - Supports Windows XP Windows 7 / 8 Vista Mac Android etc operating systems. - Built-in rechargeable lithium battery USB power supply; With extra independent power switch.