Factory 3.7V 20mAh Smart Cards Rechargeable Micro Thin Battery it is widely used in the field of ultra-thin products, such as Automobile remote control lock, smart card, E-connecting goods ,credit card, Vehicle charge checking, ultra-thin MP3 player, RFID tag, second-generation bank card, Automated management of logistic & storage, Tire pressure testing system, security system, Electronics record tracking system, Campus all-purpose card, Driver license card, Powered smart cards, Associate card, medical devices, Public transportation card, GPS System, Nonstop charging system, Wireless asset tracking tags, Container identification, Alarm system, Signal lights and the post indicator transfer, Vehicle charge checking, Back-up record power, Medical devices, Vehicle entry and exit control, Sensors, Mine personnel identification, Automated railcar identification management, Automated road charge management, Wireless and other military equipment, Medical card, Animal identification(raising cattle, sheep, pigeon, etc), Digital devices , Intellectualized door, Electronics record tracking system.