Plush Spider is approximately 10" high x 10" wide. Plastic Mat is approximately 16" high x 20' wide. Prop includes 3 - "AA" Batteries for bat and 2 - "AAA" Batteries for mat sensor. Stepping on the floor mat activates infrared sensor and the  legs shake, the eyes flash red, and prop drops down about 20" while screeching. Includes attached 30" string that retracts after activated. On/Off switch on spider. Warning: CHOKING HAZARD - small parts. Not for children under 3 years. For indoor use only. Stepping on the floor mat activates infrared sensor and the spider's legs shake, it's eyes flash, and it suddenly drops down while screeching. 3 - "AA" Batteries for spider and 2  - "AAA" Batteries for mat sensor are included. Warning: CHOKING HAZARD - small parts. Not for children under 3 years.