Features: 1. New And High Quality 2. Made Of High Quality Material, And Wear- 3. Nice Replacement For Broken Or Old One, Make You Device Work Properly 4. High Quality For Professional Use 5. Need A Professional To Install The Corresponding Accessories To Avoid Damage To The Accessories Description: 1.Module Model: 2. Working Voltage: 3.7~4.2V ( Current 1A, Please Handle It Well) 3. Support Network: Quad-Band Network 4. The Serial Port Is A TTL Serial Port And Can Be Directly Linked To The Microcontroller. 5. The Module Automatically Starts Up When Powered On And Automatically Searches For Networks. 6. Onboard One Signal Indicator Light (Slow Flashing When Signal Is Present, Fast Flashing When No Signal Is Present) 7. Small Size, There Is No Gsm Module Smaller Than This Module. 8. Full Machine Patch Processing, Reflow Soldering, Stable Performance 9. The Power Supply Can Be Directly Powered By Lithium Batteries Material: PCB colour: As shown Package Contents: 1 x Adapter Board Module (With Cable) 1 x Module 1 x Spring Antenna 2 x Pin Header 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.