Shocking customer service. Five days after ordering heat and smoke alarms they told me they had a backlog of orders and it would be another week before they could deliver. Ordered alarms from another supplier on a 48 hour delivery and cancelled Express Electrical order. Express Electrical despatched their order even though I'd cancelled it and refused to respond to emails. The order was returned to sender when it arrived, as it was no longer required. Luckily, I paid for the order through PayPal and they have refunded the money. If you need to buy alarms, DON'T use Express Electrical!