BluetoothProtocol bluetooth v4.2BR/ and standardRadio frequency With -97dBm sensitivity NZIF receiver -1,-2&-3 emitter Audio frequency CVSD& audio frequencyProduct DescriptionHardware SpecificationsChipset ESPRESSIF-ESP32 240MHz Xtensa single-/dual-core 32-bit LX6 microprocessorFLASH QSPI flash 4MBSRAM 520 kB SRAMButton ResetUSB to TTL CP2104Modular interface UART,SPI,SDIO,I2C,LED PWM,TV PWM,I2S,IRGPIO,,capacitor Contact sensor,DACLNA -amplifierDisplay IPS ST7789V 1.14 InchWorking voltage 2.7V-4.2VWorking current About 60MASleep current About 120uAWorking temperature range -40 ~ +85Power Supply SpecificationsPower Supply USB 5V/1ACharging current 500mABattery 3.7V lithium batteryJST Connector 2Pin 1.25mmUSB Type-CWi-FiStandard FCC/-RED/IC/TELEC/KCC/SRRC/NCCProtocol 802.11 b/g(802.11n, to150Mbps)A-MPDU and A-MSDU polymerization,support 0.4S Protection intervalFrequency range 2.4GHz~2.5GHz(2400M~2483.5M)Transmit Power 22dBmCommunication distance 300mcolour: blackMaterial: metal + PCsize: 51.52x25.04x8.54mmPackage Contents:1 x T-Display1 x charging cable2 x PIN pinsOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.