Add on thermal paper printer for all AutoMeter portable handheld testers.. Attaches directly over the tester and is held in place by a rubber protective boot.. Easy drop in paper replacement (Uses standard 58mm thermal paper).. Runs on a 7.4 V Li-Ion camcorder rechargeable battery (Typical battery life: 6000 print lines - 2 hour recharge time). Runs on a 7.4 V Li-Ion camcorder rechargeable battery (Typical battery life: 6000 print lines). Includes battery charger and battery charges while installed in unit (Uses standard 58mm thermal paper)