Feature: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 NewItem Type: Wireless Adapter ModuleMaterial: MetalColor: As Pictures Shown Operating Voltage: 4.5-5.5V (onboard 3.3V LDO Voltage Stabilizer)Operating Current: 0-240mAInterface Logic Voltage: 3.3V / 5V Compatible (on-board Level Conversion Circuit)Package List:2x Wireless Adapter Module