28 Keys Wireless Numeric Keyboard Financial Accounting Office Keyboard BT+USB Dual-mode Connection Built-in Lithium Battery Grey Features: BT+USB dual-mode connection, stable signal, low latency. 28 independent keys, compact layout, easy to carry and use. Small size, slim and lightweight, easy to carry and use. Scissor foot key structure, chocolate button design, the button fits your finger curve, bringing comfortable typing experience. Suitable for cashier desk, bank, financial accounting, business office, shopping mall, etc. Built-in 140mAh rechargeable lithium battery, long endurance time. Specification: Type: Numeric keyboard Material: Aluminum alloy Connection method: BT+USB Transmission distance: 10m(barrier-free) Key number: 28 Interface: Type-C, 2*USB3.0 Battery capacity: 140mAh Item size: 12.1 * 10 * 1.25cm /4.76 * 3.94 * 0.49in Packing list: 1 * Keyboard 1 * Data cable 1 * User manual