Dual SIM Card Smoother Handoff High connectivity with dual-SIM designfor automatic network detection and handover. Unlimited connectivity across different carriers’ 4G mobile networks. Support individual call, group call and missed call. Long Operation Time 3000mAh high-performance Li-ion battery capable of 30-hour operation. Support charging with a charging plug,power bank, PC or vehicle-mounted charger via USB Type-C port. AI-based Noise Reduction Filter surrounding noise to deliver clearer and high-recognition voice. 36mm large speaker and 2W audio power for high-quality and loud audio output. Precise Positioning and High Extensibility Support high-precision GPS, BDS and AGPS positioning. Support Bluetooth and NFC, allowing external Bluetooth earphone, patrol and more.