Features:

Widely use:
When traveling outdoors, it can confirm your location, avoid getting lost, find a companion, and provide assistance, can be applied in emergencies, referees, training, sports and so on.

Portable to use:
The things are small and sturdy, can be hung on the keychain as an ornament, conveninent to use, suitable size for your use and store.

Specifications:
Material: aluminum alloy
Color: as shown in the pictures
Size: as shown in the pictures

Package contents
12 x Whistles

Notes:
Since the size above is measured by hand, the size of the actual item you received could be slight different from the size above.
Due to the different monitor and light effect, the actual color may be a little different from the picture's.