Product features: Using HC - 06 from module 1, a core module, which leads to the interface includes VCC, GND, TXD, RXD, reserved LED state output pin, MCU can state whether the bluetooth is connected through the foot, from machine KEY pin is invalid. 2, the led indicates a bluetooth connection status, twinkle said there was no bluetooth connectivity, Chang Liang said bluetooth is connected and turned on the port.3, backplane 3.3 V, the input voltage 3.6 ~ 6 V, current when the unpaired about 30 ma, matching after about 10 ma, no more than 7 V input voltage 4, interface level 3.3 V, can be connected directly to all kinds of single chip microcomputer (51, AVR, PIC, ARM, MSP430, etc.), 5 V single chip can be connected directly, without MAX232 couldn't through MAX232.5, clearing the effective distance of 10 meters, more than 10 meters is possible, but not to this distance connection quality. 6,After, pairing when full duplex serial port to use, do not need to know any bluetooth protocol, but supports only one in the eight data bits, stop bits and parity checking the communication compatible withmat, which is the most commonly used communication compatible withmat, does not support other compatible withmats.7, when the bluetooth connection has not been established by pairing the AT command set baud rate, name, password, and set the parameters of the power save. After the bluetooth connection automatically switch to passthrough mode. 8, small size (3.57 cm * 1.52 cm), SMT factory, ensure the quality of the patch. And set transparent heat shrinkable tube, dust and beautiful, and there are some antistatic ability.9, this link compatible with the machine, from the function and all kinds of computer with bluetooth, bluetooth host, with most of bluetooth mobile phone, PDA, PSP and other intelligent terminal pair, not matching between from the machine.Small common sense (very important) :TXD: sender, usually expressed as the sender, normal communication RXD must connect another equipment.RXD: receiver, usually expressed as the receiver, the normal communication TXD must connect another equipment.When normal communication itself TXD pick up equipment RXD compatible witheverFrom collect spontaneous: normal communication RXD TXD connect other devices, so if you want to receive your send data as the name implies, namely receive your sending data, namely own TXD directly connected to the RXD, used to test the send and receive is normal, is the easiest fastest test method, when there is a problem to do the test first to determine whether the product failure. Also known as the loop back test.Condition: NewType: Voltage RegulatorDissipation Power: AlarmModel Number: hc-06Application: AlarmOperating Temperature: NoneSupply Voltage: 5VPay special attention to; The following are wrong connection methods:1, since the voluntary testing after the success, the use of TXD or RXD and short circuit2, module meet the power supply cause damagecolor: bluematerial: plasticPackage Contents:10 * HC-06 Transceiver ModuleOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.