Sparkfun ESP32 Thing

SparkFun ESP32 Thing is a development platform based on Espressif's ESP32, a more powerful successor to the popular ESP8266-chip. The new version adds Bluetooth LE (BLE, BT4.0, Bluetooth Smart) to the older's Wifi (802.11 BGN) and has 28 GPIO pins. The names derives from the unit's utility in Internet-of-Things (IoT) projects of any kind. The ESP32 chip has a built-in dual-core LX6 microprocessor from Tensilica, with a maximum clock frequency of 240MHz and 520kB of SRAM. The included LiPo charger makes integrating batteries into your projects easy.
The Sparkfun ESP32 has a USB-serial converter built in and can be programmed from the Arduino IDE when you install the ESP32 Arduino Core.

* Dual-core Tensilica LX6 microprocessor.
* Up to 240MHz clock frequency.
* 520kB internal SRAM.
* 4MB Flash.
* 2.2 to 3.6V operating voltage.
* 28 GPIO.
* Integrated 802.11 BGN WiFi transceiver.
* Integrated dual-mode Bluetooth (classic and BLE)
* Hardware accelerated encryption (AES, SHA2, ECC, RSA-4096).
* Integrated LiPo battery charger.
* 2.5 µA deep sleep current.
* 10-electrode capacitive touch support