Operating Frequency: 125khz
Each one has Unique ID Number on it
Compatible with all ID door access devices or readers
Size: 35mm (L) x 27mm (W) x 4mm (H)
Weight: 4g each
Water and weather resistant
Quantity: 100pcw per package
Note: The EM4100/TK4100 chip is support only read, not writable. If you want the writable keyfobs, please contact us!