When sourcing a 1.5v buzzer, you must distinguish between Active (Internal Drive) and Passive (External Drive) types. Active buzzers are easier to integrate as they produce sound when DC power is applied, while passive ones require a PWM signal. Key metrics include the Sound Pressure Level (SPL), typically ranging from 70dB to 85dB at 10cm, and the Resonant Frequency, usually around 2300Hz to 2700Hz. Ensure the Rated Current is low, generally under 30mA, to maintain energy efficiency in battery-operated devices.