Breast-conserving surgery (BCS) for non-palpable breast lesions traditionally relies on wire-guided localisation (WGL), a technique associated with limitations such as scheduling challenges, patient discomfort, and risk of wire displacement. The Scout® surgical guidance system represents a novel, wireless, and non-radioactive alternative designed to address these issues. Using electromagnetic wave and infrared light technology, the system allows for accurate preoperative placement of a small reflector, which can be detected intraoperatively with real-time audio and digital feedback, enabling precise lesion excision. The reflector can be placed in advance (with no time limit on the time between insertion and removal), improving scheduling flexibility and workflow efficiency. Compared to traditional WGL and other wire-free alternatives, Scout® offers advantages in depth detection (up to 6 cm), relative lack of MRI artefact, and intraoperative distance guidance. The non-wireless technique using scout localisation has proven to be effective with high localisation rate, clinicians’ satisfaction, and favourable patient experience despite some limitations including difficulty in localisation of reflectors in deep or haematoma, risk of signal loss with electrocautery, and cost. This chapter describes the technology, technique, clinical efficacy of the Scout® system, while offering vital guidance for implementation and addressing key considerations for clinical practice.