Test double cables by switching on the power (S for slow automatic, manual mode). Insert cables into both main and remote testers; main tester lights will sequence from 1 to G. Main tester sequence: -4-5-6-7-8-G. Remote tester sequence: -4-5-6-7-8-G (RJ45); -4-5-6 (RJ11). Abnormal connections: Open circuit (e.g., cable NO.3) results in unlit NO.3 lights on both testers. Disconnected cables cause respective lights not to turn on; fewer than two connected cables result in no lights. Disordered ends (e.g., NO.2 and NO.4) show main tester: -4-5-6-7-8-G; remote tester: 1-4-3-2-5-6-7-8-G. Short-circuited cables cause corresponding remote tester lights not to turn on; multiple short circuits result in no relevant lights. For test panels or wall plate outlets, connect matching RJ45 cables to the tester. For same-axis cables, BNC lights up when functional. Size: approx. 103x97x27mm. Material: ABS. Color: as shown in the picture. Contents: 1 x Network Cable Tester. Other items not included. Note: Light and different displays may cause slight color variation. Measurement error allowed: ±1-3cm.