1. Easy Attachment Instant Charging Simply install the Thunderbird Wireless Charging Module on a compatible Thunderbird mouse. Simply install the Thunderbird Wireless Charging Module on your compatible Thunderbird mouse and place the mouse on an Oi-compatible charging dock or charging pad for safe and portable charging. Safe and portable charging. 2. Installation Steps Step 1: Unlock the overlay button on the bottom of your Thunderbird mouse. Step 2: Replace the overlay button with the wireless charging module. Step 3: Lock the wireless charging module into place Step 4: Place the mouse on the charging dock to begin charging. 3.Specification Size: Approx. 33mmx33mmx4.6mm Weight: approx. 5g Compatible Mouse: Compatible with wireless charger, Baselisk V3 Pro, Thunderbird Mouse Dock Pro Thunderbird Wireless Charging Pad other Oi protocol charging devices