What type of batteries do Flashing Blinky Lights take and are they replaceable?

What type of batteries do Flashing Blinky Lights take and are they replaceable?

Almost all of the flashing blinky lights items have replaceable batteries. The blinking body lights and flashing rings take 2 CR927 batteries. The pendants take 3 AG3 batteries. Lighted glasses take 3 AG13 batteries.