The Happymodel Bassline is a compact 2" quadcopter designed for flying outdoors in the garden, park, playground, or even in a gym. At its core is the Happymodel X12 board, which integrates a flight controller with an F411 processor, 12A ESCs, an ELRS receiver with a ceramic SMD antenna, and an OpenVTX analog video transmitter with up to 400mW output. The flight controller provides UARTs, allowing connection of an external RC receiver. Video transmission is handled by a nano Caddx Ant camera. Propulsion comes from EX1103 11000Kv motors paired with Gemfan 2023 2" propellers. A recommended 2S battery with a capacity of 350–650mAh fits the battery holder, which accommodates cells 17mm wide and 13mm high. Everything is mounted on a carbon frame reinforced with side braces for durability, capable of withstanding many crashes. The Bassline weighs just 40g without battery, making it a fast and agile flyer.