GunVault or one of the various similar units. 4 fingertip touch pads that can be programmed for up to 6 taps in any combination.
It takes up a bit of space, but I simply put my clock radio on top of it to eliminate the space issue. I've had it about 5 years (or since my kids were about 3) and I've only replaced the battery one time.
This is what I use since I was blessed with grandkids, I have the double unit and keep two weapons and a flashlight in it. I leave it open when I go to bed and latch it during the day after removing my carry weapon.
