Housed in metal case, CyberKey has rechargeable Li-ion polymer battery which has battery life of 3–4 yrs, fully charges in 15 min to 2 hr, and provides 500 openings or 1–2 weeks of performance between charges. It records openings and denied entries, providing detailed audit reporting for management. Highly visible red and green LEDs provide feedback to users on access events and key status. Keys can be color-coded to indicate special user groups.