100% SATISFACTION GUARANTEE: We guarantee 100% customer satisfaction. Contact us if you have any questions about your purchase. If you are not satisfied with the mobile WiFi router, please contact us immediately for a full refund. Contact our customer service if you have any questions. 4G WIFI HOTSPOT & HIGH SPEED: The travel WiFi router doesn't require a broadband connection; just a 3G 4G SIM card to connect to a 5G network. It provides extremely fast internet speed for your device, even without a 5G network. Effective distance: 10m. HOW TO USE: Insert the SIM card and install the battery. Even if your SIM card is compatible with the hotspot WiFi device, it may not be plug and play. You may need to disable the SIM card's PIN code and change the APN. Supports network bands b1/2/3/5/7/8/20/40. The mobile WiFi hotspot can connect up to 10 devices simultaneously and supports smartphones, tablets, laptops, etc. KEY FEATURES: The 4G LTE mobile WiFi hotspot has a SIM card slot and a 2100mAh battery. It can be powered by an external power supply, without time limitation. It can be charged via a computer's USB port, car USB charger, or power adapter. APPLICABLE SCENARIOS: The 4G LTE USB WiFi modem is small and lightweight, suitable for parties, travel, business trips, work, outdoor live streaming, gaming, car WiFi, etc.