Bottom Line. Master Lock's 4400D Indoor Bluetooth Padlock lets you pop it open with the touch of a button and provide guest access to anyone you want. Best Deal £248.02. Buy It Now.

The Bottom Line. Master Lock's 4400D Indoor Bluetooth Padlock lets you pop it open with the touch of a button and provide guest access to anyone you want. MSRP $70.00. $227.71.

Master Lock's 4400D Indoor Bluetooth Padlock lets you pop it open with the touch of a button and provide guest access to anyone you want. Smart locks aren't new, but they generally come in the ...

Master Lock's 4400D Indoor Bluetooth Padlock lets you pop it open with the touch of a button and provide guest access to anyone you want. ... and a silver Master logo near the bottom.