for ipad air 4 10.9 pro 11 wireless keyboard leather case cover for 9.7 bluetooth keyboards with stand holder pen slot

features: built-in pen holder, non slip design 4: continuous working hours: 70-100 hours 57: button life: 500 million times 8: 10: optional color: blue, yellow, pink, purple, dark green cases 2: effective distance 10 meters 3: standby time: 30 days : charging time: 2-4 hours 6: lithium battery capacity: 200mha 9:features: built-in pen holder, non slip design material: premium plastic leather , the case don't effect the charging of apple pencil.syi