Thanks to the fact that this tool is self leveling it will always be level regardless of surface. 2 volts is what you get with this product.
From ManoMano
GRL400 set rotary laser 06159940JY - Bosch
ITS
Bosch GRL 400 H Rotation Laser, LR1 Reciever, Tripod, Measuring Rod, & Case
This product is also available at 4 unverified stores.