1. Thermal print barcode slip.
2. Auto-lock when illegal operation.
3. Over due time auto-lock.
4. Auto-warning tone.
5. LCD display screen.
6. Aautomatic detection element in every door.
7. Remain operation when power cut.
8. Rust-proofing treatment.
9. Color, shapes & functions on customer's demands.
10. Most apply for super market, library, stations, airport & etc.