ITEM NAME:2A Booster Board DC-DC Step-up Module 2/24V Boost To 5/9/12/28V SEAU Description: 1). The maximum output current: 2A (recommended for use within 1A) 2). Input voltage: 2-24V 3). Maximum output voltage: 28V (recommended for use within 26V) 4). Efficiency: 93% (efficiency of input and output pressure related) 5). Size: 30mm * 17mm * 14mm (L * W * H) Package included: 1PCS Â 2A Booster Board DC-DC Step-up Module 2/24V Boost To 5/9/12/28V.1PCS 2A Booster Board DC-DC Step-up Module 2/24V Boost To 5/9/12/28V. Efficiency: 93% (efficiency of input and output pressure related).