This is Apple's Magic Mouse 2 (Model: A1657), which is a rechargeable wireless mouse designed for Mac and iPad.
Detailed description of the mouse:
Model Number: A1657 (EMC 2923)
Serial Number: CCSNJ2XPA7
Power & Charging: There is a Lightning charging port on the bottom. It is powered by a built-in rechargeable lithium-ion battery and has an input rating of 5V ⎓ 1A.
Control & Gestures: The entire top surface is Multi-Touch. There is no physical scroll wheel; scrolling and various gestures (swiping) work through touch.
Switch & Sensor: On the bottom are an optical tracking sensor, a slide on/off switch, and two black glide rails for smooth movement.
Design & Build: Designed by Apple (California) and assembled in China. The top is made of glossy white acrylic and the bottom has an aluminum finish.