Dual-Function Design: Wear as a wristband or detachable necklace for all-day protection. 3 Smart Modes: Adjust frequency for Outdoor (strong repellency), Indoor (balanced), and Sleep (ultra-quiet) scenarios. 120Hrs Long-Lasting: 90mAh polymer battery with Type-C fast charging (5V). Chemical-Free & Safe: Hypoallergenic silicone skin contact, FCC/CE/ROHS/PSE certified. Upgraded Version Option: Choose Version 2.0 with LED time display (dual-purpose as a digital watch). TECH SPECS Material: Eco-friendly ABS+PC+PMMA casing + Skin-safe silicone strap Ultrasonic Range: 34-70,000 Hz (intelligently disrupts mosquitoes' sensory systems) Dimensions: 25.53.51.4cm (lightweight & travel-ready) Certifications: FCC, CE-EMC, ROHS, Japan PSE WHY CHOOSE OUR REPELLENT WRISTBAND? Science-Backed Efficiency: Emits variable ultrasonic waves mimicking dragonfly frequencies (mosquitoes' natural predators) to create 2-meter protection zones. Zero Noise Pollution: Sleep mode operates at