PE104BV 9/12 Volt Battery Fencer – 0.43 Stored joules – 0.33 Output joules – Powers 4km of enduro wire/tape – Uses 9 V dry cell battery or 12 V wet cell battery (sold separately). – Up to 10 weeks life using long life batteries – Diagnostic LED indicator – 2 year warranty (excludes lightening strike and water damage).