It is the cooling fan installed in cell phone jammer

It is the cooling fan installed in cell phone jammer .
For detailed documentation about this model can be purchased from the MMCA, the price is $ 500. But part of the documentation related to the SDIO is free of charge. Some can also be obtained from the memory card makers. MMC mode does not support the encryption features of SD card. From the free documents could not find these details. But for most consumers in terms of innocuous user format used to store data unprotected. The SD card supports three transmission modes: SPI mode (independent serial input and serial output), a SD mode (separate instruction and data channels, a unique transmission format), 4-bit SD mode (using the extra pins and some re-set the pins to support four wide parallel transmission) usually supports low-speed card from 0 to 400 kbit  s data transfer rate, the use of SPI and an SD transfer modes. And turning on cell phone jammer .
High-speed cards support 0 to 100 megabits  sec data transfer rate, 4-bit SD transfer modes; 0-25 megabits  sec, with an SPI and a SD mode. Required to pay for the manufacturers, vendors, and the host adapter manufacturer SD  SDIO licensing fees, $ 1,000 per year plus $ 1,500 membership fee. SDIO and MMC adapter manufacturer without licensing fees. MMC card is 7 pin connector, SD card and SDIO card uses a 9-pin interface. The SDIO introduced Webcam SD SDIO interface jack uses more than a memory card inserted. PDAs, notebook computers that support SDIO interface and so can be connected like a GPS receiver, Wi-Fi or Bluetooth adapters, modems, LAN adapters, bar code reader, FM radio, television receivers, radio frequency identity read device. The battery is inside the host of cell phone jammer . Or digital camera SD standard interface devices. Other equipment also announced that will support, including RS-232 serial port adapters, fingerprint scanners, SDIO to USB host  adapter, degaussing read device, Bluetooth  Wi-FiGPS, and radio transceivers, mobile phone modem and APRS  TNC adapter. Different types of MMC  SD card 4GB SDHC card SD card is not a Secure Digital Alliance approved only a memory card standards. Other approved formats include miniSD-enabled, microSD and SDHC. These smaller card with an adapter can be used in full-size MMC  SD  SDIO slot. If the customer wants to use cell phone jammer in the car or the location.
To know to develop the SD size of the input and output devices standard has been very, then think about the development of smaller size is simply not realistic. The SD slot supports MMC card, MMC card variant of smaller size can also be compatible with devices that support SD cards. MiniSD and microSD, RS-MMC slot compatible with full-size MMC card.