Mice & Trackballs Rapoo 1620/1680 description: Overview:RAPOO 2.4G wirele transmiion technology brings you 10-meter working range wirele connection without any interference and enables you to enjoy the freedom and comfort of wirelene.Silent left&right button reduces 90% noises, which makes it an ideal wired mouse for office, conference room, cafe, library, bedroom, help you concentrate on your work, study without disturbing others besides you. Especially at home or office, when other members having rest, you can focused on your work without worry.Please note:Middle button click is not silent.The mouse itself marked is 1620,the package model is 1680.The mouse model name is based on the original Rapoo package box.Please read clearly before order.Please don't mind if you order from us.We will not accept dispute for this reason.With Rapoo's latest energy saving technology and power switch, you can use your mouse without power interruption for up to 9 months.So small and unobtrusive, you can plug it into a USB-port and forget about it. No more worries about lost receivers.Enjoy accurate and smooth cursor control with the 1000 DPI high-definition invisible tracking engine.Features:Ergonomic:YesModel:1680/1620Power Efficient:YesWorking Mode:Optical EngineConnection Type:2.4GHzResolution:1000 DPIMouse Life Cycl:10 Million Key-prePower Supply:AA alkaline batteriesSize:111.4(L)*63.8(W) mm + / - 0.5 mmSystem Requirements:Windows 10,Windows 8,Windows 8.1,Windows 7,Windows Vista,Mac OS with USB portPackage Contents:1*Silent Wirele Mouse with original Rapoo packing box.1*Quick start guide1*Mini Nano receiver(Put in the battery slot)Please well notedAs strict inspection by the customs, so we open the seal and remove the battery. We pack it with no battery. If you care about this, please think over before place order, thank you sincerely!