Which technology enables seamless communication between smartphones and peripherals in the 2.4 GHz frequency band?

Bluetooth is the technology that enables seamless communication between smartphones and peripherals operating within the 2.4 GHz frequency band. It is specifically designed for wireless connectivity over short distances, typically up to about 30 feet (10 meters), allowing users to easily connect devices such as headphones, speakers, keyboards, and mice to their smartphones.

Bluetooth employs a method of radio transmission to facilitate this communication, which is highly effective in environments where multiple devices may be using the same frequency band. This characteristic allows for multiple Bluetooth-enabled devices to communicate without interfering with each other, utilizing frequency hopping spread spectrum technology to minimize issues with interference.

Other options, while they also deal with wireless communication, do not serve the same purpose or operate in the same way as Bluetooth. For instance, RFID is primarily used for tracking and identification, operating effectively at various frequencies but typically not designed for seamless connection between smartphones and peripherals as Bluetooth does. Infrared (IR) works by establishing a line-of-sight communication and is limited in range, while Near Field Communication (NFC) is designed for very short-range interactions, usually within a few centimeters, and is not suitable for the broader wireless connections that Bluetooth provides.