... is within 30 seconds )C) Function and operation :music / message is pre-recorded in chip and they can not erase ,not change, ... sound to client`s choose )D) Main Material :speaker , voice chip , battery , circuitry ,wire ,electronic componentsE) Power supply :cell button ... life :1000-1500 times for playing pre-recorded messageG) Sound chip shape and design :our exist shape /design , Custom own OEM shape ...