1. Powerful function: T-Call V1.4 ESP32 wireless communication module with FPC antenna and SIM card SIM800L is both ESP32 WROVER-B and SIM800L module, providing comprehensive features and functions. 2. Easy to use: The peripheral device adopts CP210X USB-to-serial port chip, which can be easily connected to a computer or device through USB to achieve fast and stable data mission. 3. Integrated design: This module integrates ESP32 WROVER-B and SIM800L modules into a compact package, so that users can enjoy the advantages of these two modules on one platform. 4. Battery powered option: The module has a lithium battery charging and discharging circuit and overcharging and overdischarging protection, it can be powered by the battery and charged at the same time, with high portability and convenience. 5. Wide compatibility: The module supports low-power voice, SMS and data mission, which is very suitable for various applications. Power supply voltage: DC3.6V~5V (TYPEC port 5V input) Onboard lithium battery interface and integrated lithium battery charging and discharging circuit Module can work while charging the battery Charging current 500MA Support WiFi and Bluetooth compatible mission Flip SIM card slot design, can use China Mobile or China Unicom's 2G/3G/4G NANO SIM card Support voice, SMS, data information mission Two onboard audio ports: including microphone-in and audio-out ports Onboard 1 IO13 pin indicator blue LED Colour:black Material:plastic Size:7.5 x 3 x 1cm Package Contents: 1 x Bluetooth module board(set) 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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 225 hours Hope you have a pleasant shopping experience!