This is an Edison Smart door sensor. The adhesive part will be delivered with a plastic sheet attached. The batteries are two AAA batteries (not included due to shipping restrictions). I tried it out, and now I'm selling it. - Brand: EDISON SMART - Product Name: Door Sensor - Wi-Fi Compatibility: 2.4GHz - Size: Main unit: 243 x 21 x 70mm, Magnet: 15 x 15 x 14mm - Operating Temperature Range: -10℃ to 50℃ - Included: Mounting screws and magnet Thank you for looking.