The Delkim Plus alarm offers the tried and tested vibration sensing, Delkim's patented system giving proportional indication of line speed/vibration with no moving parts whatsoever. Offering battery life of at least a year when using Duracell's MN1604 battery, the Delkim Plus also features two sensitity ranges, high volume and a wide tone range. Twin clear super bright LED's now feature Delkim's Patented Nitelite mode, where the twin LED's glimmer continuously at night, eliminating the need for betalights.