UBEC-5A: Voltage 5.5V-35V (2-8SLIPO) Continuous Current: 5A Instantaneous current: 6A 20 sec Output voltage: 5.25V +/- 0.5V Dimensions: 43 x 21 x 1mm; Product Weight: 18g / UBEC-7A: Operating voltage: 5.5v-35v lipo 2s-8s Continuous Current: 7A Instantaneous current: MIN 7.5A 20 sec Output voltage: 5.25V +/- 0.5V Weight: 18g / UBEC-15A: Operating voltage: 6-12s (23-45V) Continuous current 15a Instantaneous current: 30a / 10 sec Size: 55 x 28 x 5MM Weight: 36g / UBEC-3A: Operating voltage: 5.5v-26v lipo 2s-6s Continuous Current: 3A Instantaneous current: 4A 20 sec Output voltage: 5.25V +/- 0.5V Dimensions: 26 x 12 x 11mm (board section); Product Weight: 5g containing line Tool Supplies: Assembly Category Upgrade Parts/Accessories: Lithium Battery RC Parts & Accs: Batteries - LiPo Use: Vehicles & Remote Control Toys Remote Control Peripherals/Devices: Remote Controller For Vehicle Type: Airplanes Four-wheel Drive Attributes: Assemblage color:As shown Material:PC+Metal Package Contents: 1 x buck regulator module (5A) / 1 x buck regulator module (7A) / 1 x buck regulator module (15A) / 1 x buck regulator module (3A) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.