Adopting ergonomic design, the number pad can bring you comfortable typewriting experience.Featuring high sensitivity, the number pad allows for smooth using experience.Made of plastic and metal, the number pad is eco-friendly and durable to use.The length of the number pad is 14.6cm, width is 11.4cm and height is 0.9cm, so you can carry it outdoor with you conveniently.The number pad is compatible for Mac OS, for Windows, for iOS, for Android.Item Name: Wireless Number PadMaterial: Plastic, MetalModel: BT308Style: A: Aluminum Alloy, B: Plastic(Optional)Number of Keys: 34 KeysWireless/Bluetooth-compatible Solution: US Broadcom BCM 20730 ChipBluetooth-compatible Version: 3.0Keyboard Life: 5 Million TimesResponse Speed: 5 MillisecondsTransmission Distance: 10mWorking Current/Voltage: 2mA/3.7VBuilt-in Battery: YesBattery Type & Capacity: 302323-110mAh(Included)Charging time: 2HContinuous Use Time: about 50HStandby Time: >160HCompatible System: for Mac OS, for Windows, for iOS, for AndroidFeatures: Ergonomic, Sensitive, Ultra-thinSize Details: 14.6cm x 11.4cm x 0.9cm/5.75" x 4.49" x 0.35" (Approx.)Notes:Due to the light and the screen setting difference, the item's color may slightly differs from the pictures.Please allow slight dimension difference due to the manual measurement.Package Includes:1 x Wireless Number Pad1 x Charging Cable