50PCS DS1990A F5 iButton electronic key IB TAG, black Product overview A pack of 50 black iButton electronic keys with TM1990A chips compatible with DS1990A readers. Each unit features a stainless steel shell that resists corrosion and does not rust. Designed for reliable identification in access control, time attendance, and equipment authorization applications. Key benefits Ready for bulk deployment: 50 identical tags in one pack for easy rollout across multiple users or devices. Reliable identification: TM1990A chip provides stable read performance when used with DS1990A compatible readers. Robust construction: stainless steel shell provides waterproof, anti vibration, and anti corrosion protection for long service life in everyday use. Compact and easy to use: small form factor designed for quick contact reads and convenient carrying or mounting. Cost effective maintenance: durable materials reduce replacement frequency and downtime. Main features Chip model: TM1990A Compatibility: compatible with DS1990A readers Material: stainless steel shell, non rusting Protection: waterproof, anti vibration, anti corrosion Color: black Quantity: 50 pieces per pack Function: electronic key IB TAG for identification and access control Practical use scenarios Employee access and time tracking: issue to staff for contact based door access and clock in systems that support DS1990A compatibility. Locker and equipment control: assign tags to lockers or tools to manage authorized use and streamline checkouts. Machine or device authorization: use as an electronic key for machinery start permission, service mode activation, or secure vending and payment terminals. Compatibility notes Use with systems and readers that accept DS1990A compatible iButton tags. Verify reader compatibility before deployment. Package contents 50 black iButton electronic keys with TM1990A chips This product is suited for organizations and integrators looking for a durable, bulk supply of contact iButton identification tags for access control and asset management.