The H25B is a fully integrated PA unit in an ergonomic ABS handheld housing. Power can be supplied from mains or the internal rechargeable battery to deliver up to 25W output. Hands-free vocal address is made easy and convenient with the supplied VHF wireless neckband system. Built-in Bluetooth receiver and USB media player provide background music playback options, including an FM radio tuner function. Applications include demonstrations, speech reinforcement in educational scenarios and mobile public address.Power supply : main unit[tab]230Vac, 50Hz or internal rechargeable battery[br]Batteries : beltpack transmitter[tab]9Vdc PP3[br]Output power : max.[tab]25W[br]Battery life[tab]7 hours max. (voice) 2 hours max. (signal)[br]Frequency response[tab]100Hz - 12kHz[br]VHF operating distance[tab]35m (max.)[br]S/N ratio[tab]>75dB[br]Carrier frequency[tab]174.1MHz[br]Audio source[tab]USB player, FM tuner, Bluetooth receiver[br]VHF tuning stability[tab]0.005% quartz crystal locked[br]Dimensions : VHF beltpack[tab]205 x 68 x 25mm (ex. antenna)[br]Weight : VHF beltpack[tab]76g (no battery)[br]Dimensions : main unit[tab]155 x 183 x 285mm[br]Weight : main unit[tab]2.74kg[br]SPL max.[tab]80dB