SLIM ALUMINUM DESIGN: Bluetooth numeric keypad is constructed of solid, premium aluminum for durability. Features an ergonomic tilt for comfortable typing and a sleek, slim profile (0.46 lb, 5.7 × 4.4 × 0.47 inches). Designed to complement MacBook, MacBook Air/Pro, iMac, PC, Surface Pro, laptops, and desktops as a side external numeric keypad. BLUETOOTH 3.0 CONNECTION: Uses Bluetooth 3.0 for a wireless, clutter-free connection. Includes 34 keys to extend your existing keyboard. Operating range up to 10 meters. Note: For devices without built-in Bluetooth, a third-party Bluetooth adapter (not included) is required. HIGH-CAPACITY RECHARGEABLE BATTERY: Built-in 160 mAh lithium-ion rechargeable battery. Charges via included USB cable — no battery replacements needed. Features auto-sleep mode to reduce power consumption. Wakes within 3 seconds when any key is pressed. WIDELY COMPATIBLE: Includes shortcut keys and low-profile, quiet scissor-switch keys for comfortable use. Compatible with Windows, Android, iMac, MacBook Pro, MacBook Air, MacBook, Surface Pro, tablets, desktops, and laptops. Note: Not compatible with Chromebook. On macOS, the Page Up, Page Down, Search, Screenshot, and Insert keys are not functional; all number keys and most other keys work normally. CUSTOMER SATISFACTION, QUALITY GUARANTEE & 2-YEAR WARRANTY: Each unit undergoes strict quality testing before shipment. Backed by a 2-year limited warranty and lifetime technical support. with any questions — we respond within 24 hours.