This is a Malibu Access Control Key Fob Proximity EM 125 kHz with a key chain. 

Features:

• Frequency: Proximity 125kHz
• ID Inductive range: 2-10mm (.079-.39in)
• IC Inductive range: 1-5mm (.04-.20in)
• Readable and Writable Time: >100000 Times
• Reaction Time: 1-2mS
• Data Retention: >10years
• For standard size: (3-3/8" x 2-1/8")
• Material: High-quality PVC / PET / ABS
• Size: 40 x 32 x 4mm

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