Features 1.It can be used in various IoT applications. It is suitable for smart home appliances, industrial wireless control, wireless surveillance, wireless QR identification, wireless location system signals, etc. 2.It can help you make the better signal, longer range and improve its work performance. 3.Made of high quality material, which can effectively avoid corrosion and wear, and can be used durably. 4.Compact Design, it provides a highly reliable connection method and is suitable for using with various IoT hardware terminals. 5.Easy to operate, anti-aging, prolong service life. specificationFeatures: 1. It can be used in various IoT applications. It is suitable for smart home appliances, industrial wireless control, wireless surveillance, wireless QR identification, wireless location system signals, etc. 2. It can help you make the better signal, longer range and improve its work performance. 3. Made of high quality material, which can effectively avoid corrosion and wear, and can be used durably. 4. Compact Design, it provides a highly reliable connection method and is suitable for using with various IoT hardware terminals. 5. Easy to operate, anti-aging, prolong service life. : SPI Flash: default 32Mbit RAM: Internal 520kb + External 4M PSRAM Bluetooth: Bluetooth 4.2BR/EDR and BLE standards Wifi: 802.11 b/g/n/e/i Support Interface: UART/SPI/I2C/PWM Supporting TF Card: Maximum Supporting 4G O port: 9 Serial port rate: default 115 200bps Antenna form: PCB antenna on board, gain 2dBi Power supply range: 5V Working temperature: - 20~85 Size: 4 * 2.8 * 1.5cm / 1.57 * 1.1 * 0.59in Package list: 1 * Module PackageList