This is the Hitec X4 Cable with Temperature Sensor. FEATURES: Used with Hitec"s X4 Multicharger monitor battery temperatures Fits on most battery packs 17.5" (444mm) lead with Universal male J connector INCLUDES: One Hitec X4 Multicharger Temperature Sensor REQUIRES: Connecting Universal plastic connector to one of the sensor jacks on X4 Multicharger and attaching Black sensor assembly to battery HitecPart HRC44159