The TM card also called iButton (information button), was the abbreviation of Touch memory, some also called the iB card, was one metal shell seal smart card, was called in the world the most solid smart card.

Material: environmental protection silicone.

Chip: American DALLAS encryption, including DS1990A - F5, fully compatible with TM1990A - F5, i1990A.

The average failure: normal use 1/100,000 time

Manufacturer's serial number: the only 64bit number

The system logic: a 64bit password protection

Storage: 8k bits RAM

The card read: touch type

Reading and writing features: can be read write can be encrypted

Number of read and write: more than 1.5 billion times

Working temperature: -40 ℃~+85 ℃

Read: number > 350,000 times

Service life: > 20 years

TM card chip installation dimensions: phi 16.25 mm x 5.89 mm

Chip weight: 2.5g.

Main characteristics: it is a kind of encapsulated in su304-0.3 stainless steel shell of smart CARDS, strong and durable, corrosion resistant; Ultrasonic welding, waterproof performance Good. Within the semiconductor wafer with lithography 64 ROM code, each product only, no repeat. Surface laser carving serial number, and the product Logo. Support all single bus mechanism, which can realize multiple CARDS to read.

Lock principle: when I opened the door, lock the electric control system of TM card verification saved 64 passwords and password are the same. The same is to open the door , don't do different reaction. Will issue an alert if a certain number of consecutive attempts numeric string .