Introducing the ESEN Magnetic Chip in blue, designed for use with the waiter key system/iButton. This high-quality chip features a fixed 16-digit number provided by the manufacturer. Weighing just 0.01kg, this reliable magnetic key is a product of ESEN, known for their exceptional manufacturing standards. Ideal for businesses in need of a secure and reliable key system, the blue ESEN Magnetic Chip is a must-have for efficient operations.