ultra-thin case with keyboard for ipad mini 5 protective shell wireless keyboard case for ipad mini 5

3.4 Modulation method: GFSK 3.5 Frequency range: 2.402GHz to 2.480GHz 3.6 IC Specifications: BC 20730 3.7 Working distance: greater than 10 meters 3.8 Battery parameters: Battery capacity: polymer lithium battery 350mA Battery life: 3 years Working time: 150 hours Charging time: 2-3 hours 4.1 Operating temperature range: -10 ～ 55 ℃ 0-95% RH 4.2 Storage temperature range: -20 ～ 65 ℃ 0-95% RH 4.3 Temperature cycle test Test Conditions Temperature: -20 ～ 65 ℃ Humidity: 0-95% RH Test cycle: 14Cycles Product gross weight 0.6kg net weight 0.4kg