Namekian Dragon Balls

Namekian Dragon Balls are the set of Dragon Balls created by Grand Elder Guru on the planet Namek. These Dragon Balls are similar to the ones on Earth in power and appearance. However, the Namekian Dragon Balls are as large as basketballs; Krillin was surprised how big the Namekian Dragon Ball were in comparison to Earth's Dragon Balls while he was on Namek. 
There are two extra precautions taken on the Namekian Dragon Balls: first, the summoner is required to utter a Namekian password in order to summon Porunga, the Dragon of Dreams. The other precaution is that the wishes must be spoken in the Namekian language. Once Porunga is summoned, he has the ability to grant three wishes, that are somewhat different in power to Shenron's wishes. For example, Porunga could only revive one person at a time (though he was eventually modified to do mass revivals after the Frieza Saga) while Shenron could revive an infinite number of people at a time, but Porunga can revive the same person as many times as the summoner pleases, while Shenron will only revive a person once.