ADI Pro 0E-KEYXSF50 XSF 26 Bit Format Key Fobs, 50-pack; 125 KHz Frequency; Pre-programmed; Keychain Hole Key Features: - Pack of 50 - Compatible with 125kHz proximity readers programmed for 26 bit XSF format - Durable ABS construction with passive design (no battery) - Conveniently pre-programmed (26 bit XSF) Specifications: - Material: ABS - Operating Temperature: -50 to 165F (-45 to 73C) - Overall Dimensions: 1.44 x 1.18 x 0.25 inches - Weight: 0.01 pounds