Module name:DX-CP11Master+Slave; interface type:USB; Bluetooth:BLE 5.1; Visible distance:420 m; Module size:67 x 25 x 10mm; Applicable scenarios:Wireless transparent data transmission Products Using Tutorials; CP11 Bluetooth Adapter Features; Hibernation Power Consumption as low as 2uA; With housing dustproof and anti-static; Standard USB port solid and reliable; USB Bluetooth Module Application Scenarios; Easy to connect and communicate between computers, mobile phones and devices PCs and devices communicate with each other; Mobile phones and devices communicate with each other.; Mobile phones and PCs communicate with each other; Devices communicate with each other Stable transmission over long distances; Master-slave connection up to 600 metres; Mobile phone connectivity up to 240 metres Test Cases Test Equipment: Master-Slave Module Test site: Along the river highway Frequency:2405-2480MHZ Weather conditions: Cloudy Real-time temperature: 28C Modules voltage: 3.3V Antenna height: l metre Antenna gain: 0.5dBi Testing distance: 600 metres Packet loss: no more than 5% How to use the KEY button Slave module Module Status: and hold for 200ms to disconnect * Connection Status: and hold to enter pairing mode release after being connected. Standby Status Master module Connected Status: and hold for 200ms to disconnect * Standby Status: and hold for 7 seconds to clear the memory address code Multi-function status indicator Built-in four kinds of status lights, respectively indicate different working conditions unconnected:Red light flashing connected:Red light is always on When sending instructions:Green light blinks for successful transmission blue light blinks for successful reception Upon sending andreceiving data:Green light blinks for successful transmission blue light blinks for successful reception Color: Black Material: plastic Package Contents: 1 * CP11 Adapter Only the above package content, other products are not included. Note: Light reflection 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.