1,Operation Force Each key's operation force is in the range of: 180±40g.f and total deviation in 50g.f. Base on Center. 2,Key Stroke Vertical press Key with force of 180g, the key stroke within the range of: 0.8±0.2mm Base on Center. 3,Straight Distance: Straight Distance above 8.0M 4,Receiver Direction:Up Down Left Right Direction 15? at min.3M Distance. 5,Room Temp:25ºC 6,Room Humi:65~80% RH 8,Power Voltage: DC 3.0V 9,Test Environment illumination: 350Lux 10,Leakage Currency: Under 3uA No key pressed 11,Working Voltage DC2.2V~DC3.4V 12,Contact Resistance :under 3K Ohms