Features 1、Super fast response, strong anti-interference ability and high cost performance. 2、Ultra-low energy consumption and long transmission distance. 3、For ESP-01 wifi adapter module, the 3.3v voltage stabilizing circuit and the on-board level switching circuit, make the 5V singlechip easy to use with the esp-01 wi-fi module. 4、In addition, the product can be used with for R 3 or compatible board. 5、Made of high quality material, it has strong durability. Specification Condition: 100% Brand New Item Type: Wireless Adapter Module Material: Metal Color: As Pictures Shown Operating Voltage: 4.5-5.5V (onboard 3.3V LDO Voltage Stabilizer) Operating Current: 0-240mA Package List 2x Wireless Adapter Module