Linear Multi-Code Key Ring Transmitters， 1-Channel (306010)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Compatible with 300 MHz Multi-Code receivers</li><li>Power: 12-volt battery</li><li>Codes: 1，024 (set by dip switches)</li><li>RF frequency: 300 MHz</li><li>Dimensions: 1.5" W x 2.5" H x 0.625" D</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51newKNBYRL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51newKNBYRL.jpg" noproxy>