How long does the LED stay lit when you press the doorbell?

the lights light up while the chime is ringing they will stay on as long as the chime is playing. Choosing a longer chime will have a the lights on longer.

What is the battery requirement for the push buttons?

The battery is included, I bought the batteries from another company and the batteries could last easily a year or more. A23 batteries 12 V here is the link: https://www.amazon.com/dp/B07BFLCV8K

Can I pair one push button to two receivers and other push button to other two receivers?

Of course ,you can. If you want to make transmitter on a different chime and please following the below steps: 1.Plug receiver into outlet and short press receiver music button to choose your favorite music; 2.Then long press receiver VOLUME button for about 5-7 seconds until hear "ding" with light flashes to make it get into pairing mode and please notice that receiver will quit the pairing mode automatically if it doesn't get signal from transmitter in 5 seconds. 3.So,you should immediately press transmitter button to make it pair with the receiver in 5s and you will hear the music you have selected at step 1. 4.Press transmitter again and hear the music to have a final check about the pairing works,if you can hear the music you selected which mean your pairing work is successful; 5.Then one this receiver and short press music button to choose another music and re-peat the above steps(2-3-4) to make it pair with the other transmitter is ok. Best Regards, Physen

How bright are the flashing lights? I need something that will get my attention when using a headset with my TV.

It should be easy to notice if it is within your line-of-sight. The blue circle illuminates with bright light flashing in sync with the audible tones.

Brand	PHYSEN
Color	A-White(1 Button+1 Receiver)
Power Source	Battery Powered
Item Weight	3.52 ounces
Mounting Type	Wall Mount
Number of Batteries	1 12V batteries required. (included)
Recommended Uses For Product	Home
Manufacturer	PHYSEN
Product Dimensions	3.7 x 3.1 x 3.9 inches
Item model number	sos
Batteries	1 12V batteries required. (included)
Size	1 Button+1 Receiver
Material	ABS
Pattern	Modern Design
Installation Method	Self-Adhesive & Screw-In
Item Package Quantity	1
Performance Description	Memory Function Energy-saying LED Indicator
Accessory Connection Type	Wireless
Plug Format	A- US style
Switch Style	Remote
Special Features	Adjustable 58 Tones and 5 Volume Levels (Mute Mode included); LED flashing for the elderly and hearing impaired; waterproof
Usage	Reminder function; Suitable for homes, offices, hospitals and other areas
Included Components	1 remote transmitter and 1 plug-in smart doorbell receiver, double sided mounting tape, anchors, screws and battery included.
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline

Wireless Doorbell, PHYSEN Doorbell Chime Kits with 1 Transmitter 1 Receiver Waterproof, Operating at 1000ft Range, 32 Ringtones, 4 Volume Levels, LED Flash, Door Bell for Home Classroom

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