Module Body ESP-Wroom-32 Module The Usb To Serial Port Chip CP2102 Is Used Peripherally To Extend The Micro-usb Interface. It Can Be Directly Connected To The Computer Using USB For Debugging, And The Data Transmission Is Fast And Stable. Adopts A Of Wifi & Bluetooth Dual-Mode Dual-Core Wireless Communication Module, Which Integrates Bluetooth 4.2 And Wifi Transmission. This Module Is Equipped With An 18650 Battery Holder, Which Can Be Powered By The Battery Or Charge The Battery, And Is Equipped With A Temperature And Humidity Sensor. Bluetooth Audio:Cvsd And Audio 1. Toggle Switch: When It Is Turned On, The Module Enters The Working State. When It Is Turned Off, The Module Exits The Working State (The Battery Charging Circuit Is Not Affected By This Switch) 2. Red Led: It Does Not When The Battery Is Being , It Always Lights Up When It Is Fully , It Always Lights Up When The Battery Is Not Connected And Only The Usb Cable Is Used For Power Supply, And It Does Not When The Usb Cable Is Not Connected And The Battery Is Used For Power Supply. 3. Green Led: Always On When Charging The Battery, Not On When Fully , Flashing When The Battery Is Not Connected And Only The Usb Cable Is Plugged In For Power Supply. 4. Blue Led: Gp1016 Signal Indicator Light Power Supply Voltage:DC3.6V-5V (Micro-USB Port 5V Input) 18650 Battery Holder And Integrated Battery Charging And Discharging Circuit.The Module Can Work While Charging The Battery Wi-Fi Protocol:802.11 B/G/D/E/I/K/R (802.11n, To 150 Mbps), A-Mpdu And A-Msdu Aggregation, Support 0.4us Guard Interval Wi-Fi Standard:Fcc//Telec/Kcc Frequency Range: 2.4-2.5 Ghz Bluetooth Protocol:Complies With Bluetooth V4.2 Br/ And Ble Standards Note:Different Batches May Have DifferencesIn Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:Black Material:PCB Package Contents: 1 * Temperature And Moisture Soil Module 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.