Free order type (without wireless tuner) Whistle included The waterproof performance is IPX5 (main unit), so you can rest assured even in sudden heavy rain. Splashproof construction with large output megaphone is the first in the industry. The width and length are shorter than the traditional Super Megaphone and has excellent weight balance. It is also easy for women to carry. Uses a digital amplifier to save energy. Traditional Super Megaphones require 10 AA batteries, but the TWB series can be used with 8 AA batteries. You can use the LD-300 (sold separately) to power it from a DC 12 V (car battery, etc.) There are 2 free slots, so you can combine a total of 2 separate wireless tuner units (SU-350, DU-850A) or SD recorder units (SDU-300) separately. The SDU-300 cannot be incorporated into two devices. When installed SU-350, 1 x 300MHz wireless microphone (WM-3000A, 3400, 3100, 3120), and the DU-850A, 800MHz wireless microphone (WM-8400, 8240, 8030A, 8130A, 8100A, 8330A) You can use it as an additional one. The SD recorder unit (SDU-300) has a variety of playback modes. You can also record recordings on the main unBy using the external input terminal, you can use up to 4 microphones (2 wired x 2 & 2 wireless) simultaneously. Can be attached to the ST-110 speaker stand (sold separately). Power Supply: 8 x AA batteries, External Power Supply Voltage Range: DC 10 V - 16 V (12 V batteries); Output: (Max) 45 W (Rated) 30 W; Transmission Distance: (Voice) Approx. 800 m (Whistle) Approx. 1,000 m (JEITA) Battery Duration: Approx. 22 hours (Whistle) Approx. 2 hours (JEITA). 1 series (microphone) Input and AUX input sensitivity switched together; External dimensions: Width 8.6 inches (218 mm), Height 14.6 inches (371 mm), Depth 13.8 inches (350 mm). *Dimensions inside not including handle and protruding parts.