HQRP 4-Pack Coin Lithium Battery for Audi A3 2007 2008 2009 2010 2011 07 08 09 10 11 Transmitter Key Fob Remote Shell Case Cover + Coaster HQRP&reg; Four Lithium Batteries plus HQRP&reg; Coaster; Battery Voltage: 3V; Each lasts 2-6 months; 60 Days warranty!