Built-in High-Capacity Rechargeable and safe lithium polymer battery The wireless number keypad built-in high-capacity lithium batteries with 110mAh, the standby time of the keypad is up to 45 hours when fully charged. Auto sleep function ,the wireless keypad will go into sleep mode auto to save power and energy when not in use.Press any key can wake up the keypad within 3 seconds. Multi-Function Numeric Keypad: Equipped with 35 essential keys: all numbers, dedicated control keys for home, end, tab, page up/ down, calculator key, screen capture key, set of arrow keys and more. Increase your data entry speed and accuracy. NOTE: Due to Mac OS and IOS system is special system, the nine keys in the upper left are non-functional for Apple/iOS/Mac user, such as "page up", "page down", "search", "screenshot", and "ins" key. Compact Ergonomic Design: ABS material makes the number pad sleek and solid for long-lasting use. Ergonomic tilt, scissor keys and anti-slip pads on back provides optimum comfort. Auto sleep function for lower power consumption and press any key to wake up the numpad. Widely Compatibility: Attoe number pad for PC widely compatible with Windows/Android/IOS/OS, works with your smart phone, laptop, desktop, tablets, MacBook Pro/Air, MacBook Mac Mini. Customer Satisfaction- All Attoe products enjoy 30-day Free Return and Refund,12-month warranty, 24-hour Response Time for Customer Issues!