The OBT OBT-340BT is a versatile handheld megaphone designed for clear communication over long distances, reaching up to 500 meters. It delivers a power output of 35W with a frequency response between 100Hz and 10KHz, ensuring your voice remains audible and distinct while keeping distortion below 5%. You can play audio through several convenient sources including Bluetooth, USB drives, or TF cards, making it easy to broadcast pre-recorded announcements. For those who need to share a specific message repeatedly, the device features a voice recording function with selectable durations of 30, 120, or 240 seconds, plus an additional 10 seconds for a total capacity of up to 300 seconds. It also includes a sound alarm and real-time vocal transmission for immediate alerts. Constructed from high-resistance blue ABS plastic, the unit is lightweight at 0.6 kg and measures 14 x 18 x 22 cm, which helps reduce fatigue during extended use. A comfortable handle and wrist strap provide a secure grip for the user. Power is supplied by a rechargeable 3800mAh Lithium 18650 battery with a voltage of 3.7V, offering between 6 to 8 hours of standby time and easy recharging via a USB cable.