IP54 ensures waterproof and dustproof requirements under basic communication conditions. The 4000mAh ultra high performance large battery is sufficient to support ultra long communication times, and intelligent noise reduction ensures clear calls. The fully functional type-c can be charged, frequency written, programmed, and connected to headphones. GPS positioning can also be added (optional). The GS521 is the perfect choice for high-performance 4G dual card walkie talkies.