Can you disarm the system after arming it with the Remote Keyfob, without setting off any sensor by just pressing the 'disarm' button on the Keyfob?

Simple answer is yes. If you press the disarm button before you entry the house (just outside door) then you should be in range to disarm. Alternatively you can set your entrance room PIR (in my case the kitchen) to an 'entry' state, this gives you 30 seconds to disarm the alarm once inside the house.

is this suited to the 6400 kit

works with the Yale HSA6400 Wireless 4-Room Alarm Kit I got from screwfix

Can you disarm the alarm with the keyboard from outside the house when you have a door sensor fitted?

No. The door must be in entry mode (bleeping) before the fob will turn it off. You could use a remote keypad to do it.

does this work with the yale wireless hsa6400 alarm system

Yes it's working fine with mine. Very useful when you use two external doors on a regular basis. Sorry for the delay in answering. (Been away on holiday)

Yale Hsa Alarm Accessory Wirefree Pir

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Description

From the manufacturer Keypad for HSA range Accessory keypad compatible with the Yale HSA Alarms Ideally used by a rear door or upstairs as an addition to the main control unit Includes panic buttons for attracting attention Can be carried around giving added flexibility Can be added at the time of installation or at a later date Product dimensions: 4 x 18 x 13 cm

Specifications

ASIN	B002U0NAZA
Antenna Location	Safety technology
Battery Description	AAA (alkaline) and AA (alkaline)
Best Sellers Rank	29,104 in DIY & Tools ( See Top 100 in DIY & Tools ) 38 in Home Alarm Systems
Brand	Yale
Colour	White
Compatible Devices	Smart Home System, Alarm System, Light Control
Customer Reviews	4.5 4.5 out of 5 stars (413)
EU Spare Part Availability Duration	7 Years
Global Trade Identification Number	05010609097153
Included Components	x1 Pir x4 Fixings
Item Type Name	B-HSA6020
Item Weight	159 Grams
Manufacturer	Yale
Manufacturer Warranty Description	12 months manufacturer's warranty.
Model Number	HSA6020
Mounting Type	Wall Mount
Number of Batteries	3 AAA batteries required. (included)
Part Number	6.6602E+11
Power source	Battery Powered
UPC	798256170508
Unit Count	1.0 count

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