The power supply comes from the computer host and does not require an external power supply. The light-emitting tube indicator and buzzer chirp to identify the success and failure of card reading. HCE-400 series magnetic card readers comply with ANSI/ISO standards. Magnetic card standard: ISO 7811-7815 decoding method: F2F (FM) swipe speed: 10~120cm/s head life: ≥600,000 times power supply voltage: DC 5V±5% power current: ≤35mA working environment: temperature: 0℃～45℃ humidity: 10~90%