Batteries four size :A10,A13,A312,A675 Certification: ISO19001, ISO14001 Hearing aid batteries, zinc air batteryWe provide variety brands zinc air hearing aid batteries, four size , A10,A13,A312,A675.(Rayovac,Ultima,Powerone)Inner packing: 6pcs/blister cardCertification: ISO19001, ISO14001 Zinc air batteries-A10,A13,A312,A675