Ideal for security protection, this Door & Window Alarm features an easy to install small unit to attach to door posts or window sides. No wiring is needed; uses three 1.5V button cell batteries. An on/off switch is located on the left side of the alarm. Measures approximately 2 5/8" x 1 1/4" x 3/4". Comes packaged in a blister pack.,Door & Window Alarm,Almama Para Puerta Y Ventana