So I got the g502 lightspeed a while ago, and I recently leaned about power play and was worndering if the little circle module next to the mouse is the power core
Logitech G502 X Review - RTINGS.com
Logitech G502 Lightspeed Review: The Perfect Gaming Mouse Goes Wireless
Logitech G502 X Plus Wireless Gaming Mouse Bundle | eBay
Logitech G502 HERO High Performance Gaming RGB Mouse – Sohe Life
Logitech G502 Lightspeed Wireless Gaming Mouse with HERO 16K Sensor, PowerPlay Compatible, Tunable Weights and Lightsync RGB - Black