This is a multi function network cable tester kit for checking on/ off state of the line, shielded network cable testing, and long distance testing. Removable split structure and adjustable speed allow more convenient use, satisfying more needs in network maintenance. Features: Network cable pairing instrument is suitable for checking on/ off state of the line, shielded network cable testing, and long distance testing. Removable split structure, easy to separate or combine the 2 parts for meeting various needs, easy to operate. Free choice of two speeds: the default boot is a constant speed test, and the fast S gear can be adjusted manually. Crystal head on-off test: it can test 2-core, 4-core, 6-chip telephone lines; testing different cores, the corresponding lights are on. Applicable to RJ11, RJ45, telephone lines, router, optical modem, etc., widely used in network communication maintenance, wiring network engineering monitoring line maintenance. Note: Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Black/ Yellow (Optional) Material: ABS Resin Interface End: RJ11, RJ45 Power Supply: 6F22 9V Battery (Not included) Item Size: 97 x 27 x 103.4mm / 3.82 x 1.06 x 4.07in Item Weight (without battery): 98g / 3.46oz Package Size: 104 x 100 x 30mm / 4.09 x 3.94 x 1.18in Package Weight: 115g / 4.06oz Package List: 1 x Network Cable Tester 1 x User Manual (English) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.