Ntech Detachable Bluetooth English Keyboard with Brushed Appearance & Great Touch Feeling for iPad 9.7" (6th Gen) 2018/iPad Pro (5th Gen) 2017/iPad Ai

Operating distance: within 10 meters Working voltage:3.7V Standby Time: 100 days Charging time: 3-4 hours Lithium battery life:3 years Continuous time:at least 30 hours