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Specification: Material: ABS Raw Material Buttons: 35 Keys Interface: USB Receiver Effective Distance: 10m/32.81ft Battery Capacity: 250mA Features: Advanced Technology, Automatic Sleep Button Life: More Than 10 Million Times Support Systems: for Android/Windows/iOS Product Size: 145 X 120 X 19mm/5.71 X 4.72 X 0.75" Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3mm measuring deviation due to manual measurement.