This BT numeric keypad is portable, ideal for business use. Aluminium pad and ergonomic tilt design is durable and comfortable to use. Built-in battery keeps a long-time use. It supports Windows,iOS,Android systems. Aluminium Numeric Keyboard: The wireless keyboard is in sleek style. Solid aluminium coating and ergonomic tilt design make it durable and comfortable to use Rechargeable Battery: With built-in 110mAh rechargeable battery, the keyboard has 2 months standby time Lightweight and Portable: Using space aluminium material, the numeric keyboard is more lightweight and durable. You can put it into your bag and carry it for business trip X-Scissors Design: Being dustproof and anti-fingerprint, the BT keyboard keeps decent all the time. It is mute and comfortable to type. 3-5 millions times strikes ensure longer use Bluetooth 3.0 Connection: It is easily connected with Mac or laptop via BT 3.0. stable and faster connection is guaranteed Wide Compatibility: Widely compatible with BT-enabled OS, such as Windows, Android system laptop, PC, tablet, iPad and Macbook Specification: Material: Aluminium alloy + ABS Supported system: Windows,iOS,Android Key numbers: 34 keys BT: BCM20730 BT version: BT3.0 Key stroke: 5 millions Response time: 5 millisecond BT transmission distance: 10m/33ft Current: 2mA/3.7V Battery: Built-in lithium battery Battery capacity: 110mAh Charging time: 2 hrs Using time: 50 hrs Standby time:＞2 months Item size: 14.6 * 11.4 * 0.9cm / 5.75 * 4.49 * 0.35in(L * W * H) Item weight: Approx.126g / 4.44oz