Silent Mouse Optical 2.4GHz Ultra-Thin Lightweight Silent *USB is not included at this time.* 1. Mouse built-in lithium-ion battery, USB charging cable included 2. Simple design: Simple and chic design, perfect for business situations 3. Slippery material is placed on the 4 corners for smooth operation. ★★Product Specifications★★ Material: APS Size: 5.5 * 11 * 2.5CM Weight: 60g Color: Black 【Please note】: Three batteries are required separately. Applicable systems: Windows (Win 8 or higher OS Bluetooth connection) Android (Android 4.3 or higher) macOS (macOS 10.10 or higher) 2.4GHz: Desktop, laptop, etc. 【Customer Reviews】 ・The coating effect is also good, and the usability is not bad. It fits even if your hands are relatively large. Also, it's good that there is almost no clicking sound. ・The biggest advantage is that you don't have to worry about replacing batteries because it's rechargeable. I think it was a great purchase with excellent cost performance.