Stand alone emergency luminare downlight with Self Test facility. Includes Corridor lens, module (inverter) with 3.6v 4ah Ni-Cad batteries. 24hr recharge time. 1000mA discharge currrent. 700mA output current. Module size is 152x26.5x28.5mm - battery size is 38x270mm (Type 8). Module weight 150gm/battery weight 400gm.