This item is good for business @kimsungmin, great work on sharing this.

Pros :

• It does provide a lot of benefits to the host where it can help send, track and monitor informations on all rooms or selected rooms which likely to be used in hotels.
• It does really increased sales to seller since you can customized your offers and deals to the products or services that you are selling.
• On the guest side it can be used as intercom where you can directly communicate with the receptionist or help desk so they would assists your needs.
• It has also features wherein you can easily do some bookings on their services and amenities depending on the hotels services.
• It has voice controlled assistance feature where you can easily speak with your own native language and it will automatically converts to english.

Cons :

• This item is preferably for hotels, motels or apartments