Digital Loop Detector with two output relays. Four selectable loop frequencies (20~80KHz) to eliminating crosstalk. No warm-up required. Two color LED status indicators. Item No. LK-109 1. Digital Loop Detector with two output relays 2. Four selectable loop frequencies (20~80KHz) to eliminating crosstalk. 3. No warm-up required 4. Two color LED status indicators 5. Motorcycles detection also very good application