Specifications: Lightweight design small size easy for installation and low air resistance. Based on digital voice coding technology can get super clear voice and prevent disturbing from analog voice sources. Work modes: real-time broadcasting do not affect drone geomagnetic field. Anti-squeal design super clear and high strength sound great penetrability. Item Name: Megaphone Material: Plastic Megaphone Battery: 3.7V 600mAh (Included) Remote Control Battery: 3.7V 800mAh (Included) Megaphone Charging Time: about 50 Minutes Remote Control Charging Time: about 60 Minutes Use Time: about 2 Hours Volume: about 100dB Communication Channel: 462MHz Sound Distance: about 200 Meters Megaphone Size: 13.5cm x 10.2cm x 3.8cm/5.31 x 4.02 x 1.50 (Approx.) Remote Control Size: 15.5cm x 5cm x 2cm/6.10 x 1.97 x 0.79 (Approx.) Notes: Due to the light and screen setting difference the item s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Megaphone 1 x Remote Controller 1 x USB Cable 2 x Magic Sticker 1 x User Manual