[Compatible with AirTag]Specially designed for AirTag without interfering with the tracker's signal or risking damage to the device. [LED Illumination]Features three light modes: flashing, rapid flashing, and steady light, enhancing visibility and safety for your dog at night. [Rechargeable & Long-lasting]Built-in 250mAh battery with Type-C charging port. 1.5-hour charge provides 6-7 hours of use. [Waterproof Design]Ultrasonic-sealed battery compartment and transparent waterproof cover ensure protection against water immersion. [Durable Construction]High-quality buckle prevents breakage during sudden pulls, while the buckle allows for size adjustments to fit various dog breeds. Specifications: Size: M: (32-50cm) x 2.5cm Material: Webbing strap + TPU protective case + ABS transparent cover Battery Capacity: 250mAh Charging Port: Type-C Charging Time: 1.5 hours Usage Time: 6-7 hours Light Modes: Flashing, Rapid Flashing, Steady Light Waterproof: Yes