Description : 
When people whistle, the keychain would response with blinking LED and 'Beep Beep' sound.

Size                  : 35 x 58 x 13 mm (L x W x Thickness)
Color                : Black, yellow, red, orange, blue, pink for your selection
Battery             : AG10 (Button Batteries) x 3 pcs included
Availability        : 3 weeks after order confirmation 
Contact us now : sales@vtk.com.hk