Longruner JY-MCU Arduino Bluetooth Serial Pass-Through Module Transceiver Support Wireless Serial Port Module LK35<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Material: plastic </span></li><li><span class="a-list-item"> imensions: 1.73 in x 0.63 in x 0.28 in (4.4 cm x 1.6 cm x 0.7 cm) </span></li><li><span class="a-list-item"> Weight: 0.25 oz (10 g) </span></li><li><span class="a-list-item"> Compatible with bluetooth master module"， slave module"or master-slave(whole) module. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51VtjGE5hbL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51CjlDgrD5L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51kkq9G-bsL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51BSWrPblFL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/514FnImrZgL.jpg" noproxy>