Maneki Neko Lucky Cat Wireless IR Motion Sensor Electronic Welcome Guest Doorbell - White (3 x AAA)

Pros: -Small -Always works regardless the battery charge -When battery is full the sound/sensor works like a charm, if battery is low then the sensor may capt or not the movement and the sound.

Cons: -Only only two languages. -Depends too much on the battery. -Sensor intensity may be affected by environment light. -Made of plastic, which seems to be a little fragile.

Other: Nice door sensor, it will welcome you with a Japanese phrase or English one. Warning: If you have a kitty, it may enjoy of company.

Pros: - Very cute to use as an ornament; - Good size, you can see it and appreciate it from a good distance; - Well buit; - It has 2 languages to welcome you! - The motion sensor is excellent. Any movement is captured and it is activated. Good to place at stores, offices... - It brings fortune! :D

Cons: Nothing :D

Other: A good ornament for your house, store, office... it also tells you when someone enters. Great!

Pros: Cheap, loud. Triggers around 3m indoors. Two greetings: English and Chinese. Uses 3 AAA's.

Cons: Limited range (1m) outdoors -- may be fooled by sunlight but not sure exactly.

Other: This seems fine for normal applications. My indoor tests were all successful, and the only false trigger there was when sun fell on it suddenly.