Battery is included. Contains: 5 in 1 Remote Control fit for Canon Nikon Sony Pentax Olympus x1 Lithium CR2025 battery (inside) x1Introduction :With ... remotely from a distance. The compatible camera has a built-in infrared receiver for this remote trigger device Works from up to 8 ... , E-10, E-100RS, E-2500, E-2100for Pentax:Km, K200D, K100D, K110D, K20D, K10D, stDS2 , istDS, istDL2, istDL,istD, ist, ...