1. Bluetooth amplifier adapter with various interfaces

USB interface: flash disk type, Mini Key type, folding type, box. Used on Windows computers with USB ports and Macs with Mac OS X. For example, Sony’s PCGA-BA1, small and cute, weighs only 5g, the indicator light on the tail glows blue light during use, and has a working distance of 10m. With Sony’s unique BlueSpace software, it is very convenient to use. Unfortunately, this software can only be used on Sony’s own bluetooth amplifier adapter.

PC card interface: may have an antenna, used in notebook computers, handheld computers (HPC). For example, Xircom CreditCard Bluetooth Adapter only occupies one PCMCIA slot. It supports four functions of file transfer, fax, dial-up network and bluetooth amplifier virtual serial port.

CF card interface: used on PDAs with CF card slots, and also on laptops and handheld computers (plus CF to PC card adapter).

MS memory stick interface: Sony infostickbluetooth amplifier memory stick, used for Sony Clie, temporarily cannot be used on Sony laptops or desktops with memory stick interface, because Sony has not released a driver for Windows system.

SD card interface: Toshiba bluetooth amplifierin SD card, used on PDA with SD card slot.

Extended back clip: used for PDAs with special interfaces. For example, the blue5 back clip for Palm V, Vx, IBM WorkPad c3 launched by TDK System, the blueM back clip for Palm m125, m130, m500, m505, m515, IBM Workpad c500, and the blueM back clip for Palm V, Vx, and IBM WorkPad c500. The bluePAQ back clip of the old Pocket PC iPAQ. This kind of back clip is generally not cheap. Instead of buying a back clip, it is better to buy a second-hand PDA with built-in bluetooth amplifier, such as Palmone’s TT.

Motherboard or computer built-in: For example, MSI 648 Max motherboard, Toshiba Tecra 9000 notebook with built-in bluetooth amplifier and IEEE802.11b dual wireless chip, Acer TravelMate C111TCi Centrino tablet.

2. Cell phone

Early classic models include Ericsson T39, Ericsson T68, Siemens S55, Sony Ericsson T68i, T68ie, Nokia 7650, Philips 820, 826, etc. Recently released almost all European and American mobile phones above 2500 yuan have built-in bluetooth amplifier function, such as Nokia 9500, Sony Ericsson K700 and so on.

3. Pocket PC

There are also many products in the Pocket PC, such as iPAQ5450, iPAQ3870/3970, Pocket Loox 600, Sony Clie NZ90, Sony Clie TG50, Palmone Tungsten T, Palm Tungsten T 2, Palm Tungsten T 3, PalmoneTero 600, etc.

It is recommended to buy a handheld device that has a built-in bluetooth amplifier. Because the bluetooth amplifier accessories of handheld devices are very expensive, and most of them do not have a power supply, they consume more power than built-in chips. The computer does not have to be built-in, just pick a brand-name USB V1.1 version bluetooth amplifier adapter, which is cheap, and a good driver can be as stable as a famous manufacturer’s product. In addition, the bluetooth amplifier connected to the CF interface of the notebook computer through the adapter card cannot be plug-and-played, and it usually needs to restart Windows to work. Because the CFbluetooth amplifier card uses a virtual serial port to communicate with the computer, the virtual serial port does not support plug and play. As for the 100M bluetooth amplifier adapter, it usually has a signal amplifier. There are three levels of signal transmission distance in the bluetooth amplifier specification, Class1 is 100 meters, Class2 is 10 meters, and Class3 is 10 cm. NEC box-shaped bluetooth amplifiers are all Class 2 and have a communication distance of up to 10 meters.

Of course, whether it is 10 meters or 100 meters, it is a theoretical distance. In actual use, the communication distance may generally be compromised due to obstacles or signal interference from other equipment. When the distance reaches a certain level, the bluetooth amplifier transmission becomes very slow and eventually disconnects.