If your client base is on the go travelers then branded travel items are a promo product worth investigating. As you know when a promo product delivers functional value for the recipient the brand on the item gains greater resonance. The item is even often called my “brand X” adapter for example.
Remember, if your client type is travelling executives, then they hang around other travelling executives – often borrowing each other’s accessories. Gaining further spread of your brand/message.
There a quite a few options allowing for the variance in power outlets between countries. The handiest of which how USB ports included. Promo Power Adapters make for great brand awareness, staff rewards and Christmas gifts for clients and staff.