TONOR Network Lan Cable Tester, RJ45 RJ11 RJ12 CAT5 CAT 6 UTP Net Test Tool (Green) Mute button design, No click sound. All the keys are mute when click, so that you can enjoy a silent environment when reading online and browsing the website Stylish appearance, lightweight , comfortable claw/ palm grip, long-term durability. Requires 2*AAA battery to run. (Not included) USB receiver stows away inside the mouse when not in use; Wireless mouse with tiny USB receiver.compatible with Windows 2000/Vista/Win7/Win8/Mac OS X(10.2.8) or higher. Warranty: a. 1 year warranty. b. 2 months hassle-free return policy. c. Seller pays for return if item is DOA or not as described. Fulfilled by amazon with fast shipping.