This dual-purpose mahcine is affordable and amazing for setting an antitheft tool as well as an warning alarm on bikes. For your beloved bike， you should not miss it!<br><br><strong>Features:</strong><br>A dual-purpose machine can be a powerful horn or a careful warning alarm.<br>Loud alarm: Up to 110 decibel.<br>One key control: Through a wire connects a key and the alarm.<br>Surveillance control: Password can be set to avoid being stole and increase securoty surveillance， safe and reliable.<br>Vibration alarm: Enhance the sound power and security surveillance. ?<br>Password is changeable according to user manual so that the alarm can be more reliable.<br>Rain resistance， splash resistance.<br>Powered up by four button batteries(included).<br><br><strong>Specifications:</strong><br>Brand: Sunding<br>Color: Black / Green (optional)<br>Material: ABS<br>Voltage: 6V<br>Alarm weight: 57g / 2.00oz<br>Package size: 10.5 * 7.5 * 4.5cm / 4.13 * 2.95 * 1.77in (L * W * H )<br>Package weight: 81g / 2.85oz<br><br><strong>Package List:</strong><br>1 * Alarm<br>2 * Screw<br>2 * Screw Nut<br>2 * Tie<br>1 * User Manual(English)