Hey guys!
Having another gadget here for you : the Kerui M8 Doorbell and Alarm device
(my pimatic coffee cup as size comparison 
)
With this device you are having several possibilities :
- Doorbell
- Nightlight
- Alarm (very loud!)
- Welcome Voice (useless, since the voice is not clearly understandable)
- Doorbell / Music device playing MP3 from MicroSD card!
All these functions can be triggered with a HomeduinoRF buttonsdevice.
{
"buttons": [
{
"id": "tuerklingel",
"text": "Tuerklingel",
"protocols": [
{
"name": "switch5",
"options": {
"id": 139364,
"unit": 0,
"state": true,
"all": true
},
"rfrepeats": 11
}
]
},
{
"id": "mp3klingel",
"text": "Mp3 Klingel",
"protocols": [
{
"name": "switch5",
"options": {
"id": 139365,
"unit": 0,
"state": true,
"all": true
},
"rfrepeats": 11
}
]
},
{
"id": "nachtlicht",
"text": "Nachtlicht",
"protocols": [
{
"name": "switch22",
"options": {
"id": 69393,
"command": "A"
},
"rfrepeats": 11
}
]
},
{
"id": "alarm",
"text": "Alarm",
"protocols": [
{
"name": "switch22",
"options": {
"id": 69393,
"command": "D"
},
"rfrepeats": 11
}
]
},
{
"id": "scharfschalten",
"text": "Alarm ein",
"protocols": [
{
"name": "switch22",
"options": {
"id": 69393,
"command": "C"
},
"rfrepeats": 11
}
]
},
{
"id": "entschaerfen",
"text": "Alarm aus",
"protocols": [
{
"name": "switch22",
"options": {
"id": 69393,
"command": "B"
},
"rfrepeats": 11
}
]
}
],
"echo": {
"additionalNames": []
},
"id": "klingel",
"name": "Klingel",
"class": "HomeduinoRFButtonsDevice"
}
You are able to trigger the functions of the device with the doorbell button and with the 4-button remote.
You have to learn a Button for each function, so did I for the MP3 Music feature. Now i’m having Metallica’s “for whom the bell tolls” as doorbell 
(for teaching a Button to the device without remote just take my above device, set the M8 doorbell into learning mode at the desired function like doorbell, nightlight etc … and press the button in pimatic.
the doorbell button can be used as switch 5, the 4-buttons remote has the switch 22 protocol. the buttons are then segmented as command A to D
I raised the RF repeats to 11 so the RF reception of the M8 Doorbell is better then.
Another interesting thing is that you can arm/disarm the alarm sound for the device. You are able to easily create an alarm system with pimatic. Unfortunately the alarm does not continue until it is disabled. The siren will shrill for approx 30 seconds.
But that shouldn’t be a problem at all since you can trigger the alarm with rules or with a PIR for example.
On the backside of the device you will find the buttons for the several modes, on the bottom there you will see the SD-slot AND a mico USB jack for power! Very nice 
Now have fun with the Kerui M8 Doorbell device and let the “Hells Bells” ring 
