The SunDing SD-605 bicycle alarm combined with an electronic bell – the device can prevent bicycle theft and make the cyclist audible on the road. Thanks to the built-in vibration sensor, it activates at the slightest movement, after which a loud siren turns on.
The alarm body has 4 buttons used to set the alarm password. The bell is activated by pressing an external button, which can be installed in any convenient location.
To put the alarm in armed mode, you need to:

Press and hold the "0" button for 2 seconds; after the first second, there will be one short sound, and after the second, two short sounds.
Release the button and wait for a short sound after 3 seconds, which means the alarm is activated.

To change the password, you need to:

Press and hold the "3" button for 3 seconds, after which a short sound will follow.
Enter the default password - 0000.
After two short sounds, enter your new password. (Attention! The password must consist of 4 digits).

Waterproof casing
Conveniently mounts on bicycle handlebars
Inner diameter of mounting clamp: 2.5 cm
Power: 4 LR44 button-cell batteries (pre-installed)
Material: impact-resistant plastic
Device size: 5 x 4.5 x 4.4 cm
Wire length from alarm to button: 17 cm
Device weight: 45 g
Package contents: SunDING SD-605, mounting bolts, cable ties

P. S. If the password is forgotten – remove the batteries for 10 seconds, then reset the password. The default password will be 0000 again.