Amitabha is a buddha in Mahayana Buddhism and the principal buddha in Pure Land Buddhism. The deity is said to provide salvation to people with its infinite light (wisdom) and infinite life. From one of its forty-eight vows, it was interpreted that anyone would be guided to his Pure Land if they chanted his name, which resulted in Amitabha becoming widely worshiped in Japan. The pose with the hands represents the Amitabha taking people to the Pure Land. Like the Buddha, or Gautama Buddha / Shaka, he is not wearing accessories of any kind
This statue is "眼入", meaning that it has glass eyes painted with pupils inserted. The insertion of transparent eyes into Buddhist statues is a uniquely Japanese technique. One remarkable point of this technique is that when you look at this statue, your eyes will still match the eyes of the Buddha from any angle. Many people believe that this helps you appreciate the connection you have with the Buddha.
This Buddha statue has small celestial beings in the aura. These beings are flying around the Buddha statue and celerating the Buddha. This type of aura is called hiten (飛天) and is typical amongst Buddhist sculptures.