Hign-concerned Chemical:None Time to market:Aug-13 Gross Weight:70g Operation Mode:Opto-electronic Power Type:Battery Number of Buttons:4 Number of Rollers:1 pcs Hand Orientation:Both Hands Package:Yes Style:Mini,Finger DPI:1600 Interface Type:bluetooth Type:Bluetooth Wireless Brand Name:HKQH Origin:Mainland China Certification:None Wireless transmission range:10M Support System:Windows /for Mac Features 1:mute mice Features 2:wireless mice,wireless mouse Features 3:silent mouse,noiseless mouse Features 4:computer Mouse, laptop mouse,pc mouse, mouse bluetooth Features 5:for laptop, desktop,home office use Features 6:bluetooth Mice for Home/Office Features 7:for iOS / Android / Windows Tabllet Features 8:Wireless Mouse For Tablet