The characteristics and limitations of wireless headphones In addition to traditional wired headsets, wireless headsets are becoming more popular. Wireless headsets typically use infrared, radio or Bluetooth to send messages. 1. Infrared earphone Features: Must be transmitted within the line of sight, application location restrictions are large, but less interference. Restriction: Signal transmission may be affected by heavy sunlight. 2. RF Wireless Headset Features: High penetration, users can hear music in the environment of about 100 meters, indoors or outdoors, but the farther the distance is, the more the sound is affected. Restriction: RF headsets are far away from the "range" and are susceptible to interference from other signals. They may miss the music from another transmitter. Therefore, RF headsets usually have two or three bands to choose from, such as using multiple infrared or RF in the same place. Headphones, as long as they are tuned to the same band, they can receive signals at the same time, and users can listen at the same time. 3. Bluetooth headset Features: Bluetooth headset with digital RF transmission to avoid signal interference or incorrect reception of messages. Restriction: Some models can be connected to a normal player with a common 3.5 mm cable, and some models can only be paired with a player or mobile phone with a Bluetooth design. In addition, because of the design and transmission power of Bluetooth, the transmission distance is short, which is generally suitable for portable players. 4. Closed and open The enclosed earphone is separated from the outside by a space, and a cushion or sponge covers the ear to achieve a high degree of shielding effect and less leakage. Open earphone housings usually have a lot of small holes to create a balanced sound. Because design ventilation is better, it may be more suitable for hot and humid climate or long-term use. 5. Noise reduction and sound insulation are different. Some earphones have a noise cancelling (referred to as noise reduction) design, claiming to use electronic noise reduction, especially for continuous low frequency noise. However, these types of noise reduction circuits require power. Some models not only lose noise reduction when there is no battery, but also can't continue listening to music. Users need to pay attention. Some in-ear models claim to have an isolating or isolator design. The cushions of the headphones force the ear holes to isolate a lot of low to high frequency noise, so it can also reduce external noise. Users need to understand the difference between noise reduction and noise reduction methods. The former is active and requires power and circuitry. The latter relies on earplugs or cushions, without the need for batteries or charging. 6. Earphone accessories Many larger headset models come with large or small headphone (6.35mm or 3.5mm) conversion plugs for home audio combinations, headphone jacks for mini or portable audio equipment; compact headphone models for Walkman, etc. Portable equipment, only with small plugs. In-ear headphones are generally equipped with soft rubber sleeves of different sizes to match the size of the ear holes of different users. Some models also come with a tank-mounted seat plug for listening to music while on the plane. Try using a comfortable headset If you can try it before you buy it, you should try wearing it. After the test, you can turn the body or move the head and neck to test whether the earphone will be easily displaced or dropped. If the earphone design is not good or does not match the ear hole, it will affect the wearing. Comfort. Headphones usually have a headband that fits snugly against the ear. It is not easy to walk. It is usually covered with soft leather or thick sponge. It is comfortable to wear, but users should also pay attention to the weather. When the weather is wet and hot, soft skin and sponge may bring sultry heat. The feeling is that the material is more susceptible to mildew, so it should be properly collected after use. 
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