โทรโข่ง, การประกาศ, เสียง, ผู้พูด, ลำโพง, ดัง, สัญญาณรบกวน, เครื่องขยายเสียง, การแจ้งเตือน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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