Cordless telephone systems used in manufacturing site offices and administrative departments. Supports mobile communication within factories, contact during supervisor rounds, quality control inspection result reporting, and communication between production lines. Primarily industrial-grade models with dustproof/waterproof specifications and vibration resistance. Product lineup emphasizes multiple handset support, long-duration battery for extended calls, and clear audio quality communication. Portable telephone equipment clearly distinguished from wired phones, IP phones, and intercoms.