what is the upgrade mentioned in the product description?

Dear customer, Thank you for your question. This new product is an upgrade of the original product (ASIN:B09JZ3YTBZ ). The original product requires the call button to be paired with the smartphone via wifi, the working principle is to press the call button, the receiver and the smartphone will receive an alarm notification. The new product requires the receiver to be paired with a smartphone via wifi. The working principle is that the receiver sends a notification signal to the smartphone after receiving the signal from the pager. At the same time, the music and volume of the receiver can be modified in the TUYA APP. If you have other TUYA products, you can pair it with this receiver (gateway), so that the TUYA smart devices in your home form a system for your better use. Hope my reply can help you. Have a nice day!

Is this product works with alexa ?

Possibly. I have Tuya smart plugs and they work fine with Alexa

Does it come with a 3 pin plug for UK use?

Dear customer, Thank you for your question. The receiver of this product is a standard UK plug. Hope my reply can help you. Have a nice day!

Can I request an additional receiver with this for a big house ? The kids usually are in their own rooms.

Dear customer, Thank you for your question. Our store does not yet have the purchase link of a separate TUYA WIFI receiver. If you need it, you can contact the seller through the following path（Sold by EwiMart - Ask a question）, and they will give you a satisfactory answer. Hope my reply can help you. Have a nice day!

Battery description	2 CR2 batteries
Number of batteries	2 CR2 batteries required. (included)
Voltage	12 Volts
Control method	App
Noise level	5 Decibels
Mounting type	Wall Mount
Maximum range	150 Metres
Sensor technology	Push Button
Manufacturer	EASTWAY INTERNATIONAL (HK) LIMITED
Product Dimensions	12 x 9 x 9 cm; 200 g
Batteries	2 CR2 batteries required. (included)
Item model number	WM522 E57 1-2
Item Package Quantity	1
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Lithium Manganese Dioxide
Item Weight	200 g

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