Last year I purchased a wireless timer from Satechi for my Nikon D90. Since reliable and detailed reviews of Satechi products are scarce on the internet, I thought of writing one based on my experience.
The timer can be connected to the camera wirelessly and otherwise.
For wireless connection, a receiver piece needs to be connected to the camera body which sits on the flash shoe. The receiver is powered by a CR2 Lithium battery. An on-off switch is provided to conserve battery.
Note : It is not necessary that the receiver has to sit in the flash shoe. It is suggested for ease of use.
Two AA battery powers the transmitter. As already mentioned, a CR2 Lithium battery powers the receiver.
Satechi timer is a sturdy reliable product and worth the money for all your wireless trigger needs.
A day after I received the product, I was surprised to see an email from them asking whether it is working as it should. I must say that was a nice touch to win me over.