Product features: 1, All by the latest patch components and integrated circuit,the use of simple, stable performance. 2, The surface uses the most advanced international oxidation treatment, the use of aluminum shell, good heat dissipation. 3, The effective shielding distance radius of 1-20 meters, the signal intensity of interference radius still depends on the specific region. 4, The body can have a clear visual part of the power indicator,side by side with a separate switch control key. 5, Cooling fan, can be used directly in the car, car charger and AC charger. 6,Easy to carry hidden, low power consumption, no damage to the human body and environmental protection.