The current of the power supply of a semiconductor radio is about 50mA. Radios can be classified from different angles.

According to the received broadcast system, it can be divided into amplitude modulation radios, frequency modulation radios, etc.; according to the received band, it can be divided into medium wave radios, short wave radios, full-band radios, etc.; according to the volume, it can be divided into desktop radios, portable radios, micro radios, etc. 

 1: Full-band radio can listen to medium wave, short wave, (FM), etc., and medium wave/FM broadcasts can be set to local standards suitable for countries around the world. 

2: The second intermediate frequency radio is used to receive shortwave radio stations and can enhance the reception effect. It is better than general first intermediate frequency radio. The second intermediate frequency technology raises the first intermediate frequency frequency to 10.5 MHz and can effectively suppress image interference. It is more sensitive and clearer for receiving shortwave bands. 

3: The difference is not very big. It depends on what kind of radio it is. Generally, full-band and multi-band radios only differ in how many stations they receive. Stereo has better listening effects than ordinary ones. Nowadays, small radios mostly use No. 5 batteries, and mini radios generally use No. 7 batteries.

Does a semiconductor radio have radiation on the human body? Because the radio absorbs radiation and converts electronic waves into sound. So there is no radiation on the human body from it.

The so-called radiation of semiconductors is mainly electromagnetic field radiation generated by devices during work. Other semiconductor devices with X-ray functions will only encounter radiation in special occupations.

In daily life, mobile phones will produce larger electromagnetic fields when dialing numbers, and computer monitors and televisions will produce magnetic fields of different sizes. 

The impact of radiation on people is a subtle theory that most people in cities today have semiconductor radiation in their normal lives every day, but most of them are very small magnetic fields.