Based on GPIO 40PIN interface design, easy to plug directly into Nano Supports 5G/4G/3G multiple modes of Internet access, making calls, sending text messages, cloud platform communication, etc. Onboard USB 3.1 interface for testing AT commands, sending text messages, cloud platform communication, making phone calls, obtaining GNSS positioning information, etc. Onboard SIM card slot, supports 1.8V and 3V SIM cards Onboard 2 LED indicators for easy viewing of module operating status Support AT control (based on 3GPP 27.007, 27.005 and V.25TER set) Onboard audio interface and audio decoding chip, can be used for voice operations such as making phone calls Integrated multi-constellation system dual-frequency positioning: GPS, GLONASS, Beidou, Galileo and QZSS Support Windows/Linux/Android and other operating systems Due to different batches, the appearance, color, and printed words of the product , which does not affect its use. Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on. Voltage: AC110V Colour:black Material:PCB+Plastic Package Contents: 1 x For Nano 5G/4G/3G expansion board 1 x RM520N- 4 x 5G antenna 1 x GPS antenna 1 x Double-ended USB3.0 male to male data cable 1 x USB 3.0 Adapter (C) 1 x Heat sink 1 x Screw pack 1 adapter 1 x For Nano black acrylic panel Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.