Features 1.Readable Key Fobs: Access control keychains are read only, not rewritable, you cannot reprogram them, with high precise and reliability. 2.High Sensitivity: Access control tags use smart chips, thick and high quality copper wires, and sensitive induction. 3.Unique Numbering: Each key fob has been preset with a unique number, this 10 digit number is engraved on the label casing. 4.Wide Application: Applicable to residential access control, apartments, hotels, hospitals, schools, elevators, buses, subways. 5.Durable Material: The readable key fobs shell is made of high quality ABS material, which is lightweight, shock resistant and drop resistant. Specification Item Type: Door Entry Key Fobs Material: ABS, copper Application: Keychain used in access control system Working Distance: Approx. 0-10cm/0-3.94in Operating Temperature: -25°C + 75°C Storage Temperature: -15°C + 45°C Multiple Visits: Yes Anti Interference: Yes Package List 100 x Door Entry Key Fob Note Do not place the product in an excessively corrosive, humid and high temperature environment!