Features: 2.4G wireless connection, up to 10m transmission distance, stable signal transmission, no driver required, plug and play. 35 independent keys, compact layout, easy to carry and use. Ergonomic design, fit your fingers, relieve fatigue and improve work efficiency, comfortable typing. Wide compatibility, support Windows, Android, Mac OS systems. Suitable for cashier desk, bank, financial accounting, business office, shopping mall, etc. Built-in 250mAh rechargeable lithium battery, long endurance time, easy to charge with USB cable, no need to change the battery. Specification: Type: Numeric keyboard Color: Black Material: ABS Key number: 35 Connection method: 2.4G Transmission distance: 10m Supported OS: Windows, Android, Mac OS Input: 3.3V Wake up time: 2s Battery capacity: 250mAh Standby time: About 60 days Item size: 14.5 * 12 * 1.8cm /5.71 * 4.72 * 0.71in Item weight: Approx. 162g /5.71oz Packing list: 1 * Keyboard 1 * USB receiver 1 * USB cable 1 * User manual