STEELMAN 411 EngineEAR Replacement Wand Features an 8-inch flexible gooseneck piezoelectric microphone and a 5-inch removable metal probe accessory Built-in easily accessible 3.5mm headphone jack allows the technician to utilize the headphones of their choice Replacement unit for the STEELMAN 65001 EngineEAR, 06400 TracerEAR and 06606 ChassisEAR/EngineEAR Combo unit Uses a conveniently replaceable standard 9V battery (not included)