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:_x000D_ 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._x000D_ 2. It can help you make the better signal, longer range and improve its work performance._x000D_ 3. Made of high quality material, which can effectively avoid corrosion and wear, and can be used durably._x000D_ 4. Compact Design, it provides a highly reliable connection method and is suitable for using with various IoT hardware terminals._x000D_ 5. Easy to operate, anti-aging, prolong service life._x000D_ _x000D_ :_x000D_ SPI Flash: default 32Mbit_x000D_ RAM: Internal 520kb + External 4M PSRAM_x000D_ Bluetooth: Bluetooth 4.2BR/EDR and BLE standards_x000D_ Wifi: 802.11 b/g/n/e/i_x000D_ Support Interface: UART/SPI/I2C/PWM_x000D_ Supporting TF Card: Maximum Supporting 4G_x000D_ O port: 9_x000D_ Serial port rate: default 115 200bps_x000D_ Antenna form: PCB antenna on board, gain 2dBi_x000D_ Power supply range: 5V_x000D_ Working temperature: - 20~85_x000D_ Size: 4 * 2.8 * 1.5cm / 1.57 * 1.1 * 0.59in _x000D_ _x000D_ Package list:_x000D_ 1 * Module PackageList