VOLMA Low Voltage LiPo Buzzer and Lost Model Finder Alarm for Quadcopter, RC Air Plane, Helicopter CONFIGURABLE LOW VOLTAGE MONITOR: The VOLMA features a highly-configurable voltage monitor with thresholds of 3.2-3.8v and 1-8S pass through to employ additional balance port accessories. VISUAL & AUDIBLE ALARM: Never lose an aircraft, quadcopter or drone again with our versatile alarm function that features two extremely loud 90db buzzers and an ultra-bright 3W LED bulb. MULTIPURPOSE RC ACCESSORY: VOLMA fits in almost any radio control airplane, quadcopter, drone, or flyer. Its the premier low voltage/lost model alarm combo for hobbyists and professional flyers alike. Simply set a time-out and the alarm will sound and flash when the timer expires. COMPACT & LIGHTWEIGHT: Fit the VOLMA into the smallest spaces without adding weight or bulk to your aircraft. Both extremely small and lightweight, it can be added to almost any configuration. AMERICAN ENGINEERING: Each of our VOLMA dual function alarms is designed and developed in-house and sold exclusively by Sabertronics.