M1 Non-Contacting IC Card Hikvision, DS-K7M102-M Sensing Frequency: 13.56MHz Memory Capacity: 1024 bit Function: Read and Write Sensing Distance: 0cm to 4cm Working Temperature: -10°C to +50°C (14°F to +122° F) Dimensions (L×W×H): 26mm × 50mm × 4mm (1.02 × 1.97 × 0.16 ) Material: PVC