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BLE Heating Socks Shoes Battery Motherboard Iwarmu APP Customized PCBA. APP Wireless Control: Remote control via smartphone for temperature, timer, and status monitoring. Customized PCBA Design: Fully customizable multilayer PCB with tailored dimensions and functions. Quick Heat Mode: High-power rapid heating with 1-minute auto-shutdown for safety. Real-time Status Feedback: Live display of connection state and heating status on the mobile app. DC-5V Power Output: Built-in USB-A port for charging small external electronic devices. IP54 Protection Grade: Dustproof and splash-proof design suitable for daily wearable use. Comprehensive Certifications: Certified with ISO, RoHS, CE, CQC, and IATF16949 standards.