Highly rated and reviewed, Logitech G502 Proteus Core Tunable Gaming Mouse. Gently used for about a year (non-gaming use, actually), and in excellent working condition, with all original parts except for paper user manual. Please see the pics and more detail below (Note: small white specs seen in the photos are not present on the mouse--rather, dust on my camera lens...)

• Logitech
• Name: G502
• Model: 910-004074
• Type: Wired, USB
• Tracking Method: Optical
• Maximum dpi 12000 dpi
• Mouse Adjustable Weight Yes
• Scrolling Capability: Tilt Wheel
• Color: Black

Features:

• Personally-tuned Performance. You control the weight and balance

• Magnetic weight-cavity door

• 11 programmable buttons

• In-game DPI shifting

• Gaming-grade dual-mode, hyper-fast scroll wheel

• 32-bit microcontroller

• 3 on-board profiles

• 1 millisecond report rate

• Primary buttons rated to 20 million clicks

• Mechanical microswitches

• Improved keyplate design for better click feeling and performance

• Braided cable with hook and loop cable tie

• Sleep mode disabled

• 3 DPI indicator LEDs

• Rubber grips