?<strong>Features:</strong><br />One transmitter matches one receiver.<br />Credit card sized transmitter fits in any wallet or purse.<br />Key chain receiver can be connected with your devices easily like keys， wallets， etc.<br />Adopts RF wireless technology， stable performance.<br />Anti-lost function， easy and quick to locate your items.<br />Long working distance.<br />No radiation， environmental protection.<br /><br /><strong>Specifications:</strong><br />Working distance: 25-30m (in open field)<br />Working frequency: 433.92MHz    <br />Working voltage: 3V<br />Current: 2mA<br />Power supplied by: transmitter: 1 * CR2016， receiver: 1 * CR2032<br />Transmitter size: 8 * 5 * 0.4cm / 3.1 * 1.9 * 0.1in<br />Transmitter weight: 15g / 0.5oz<br />Receiver size: max. 4.4 * 2.8 * 1.2cm / 1.7 * 1.1 * 0.4in<br />Receiver weight: 11g / 0.3oz<br />Package size: approx. 20.5 * 14.2 * 2.2cm / 8 * 5.6 * 0.8in<br />Package weight: 58g / 2oz<br /><br /><strong>Packing list:</strong><br />1 * Transmitter<br />1 * Receiver