Instruction Sheet for CAR HANDS FREE KIT (88MH2) Model: PG-SF-01 1, Features A, The receiver will be automatically off after 45 minutes after the power was turned ON, in order to save the batteries when user forget fo turn-off it B, The frequency is 88MHZ. Gs Talk Time for Transmitter: 18 Hours U, Forging in the cat and desk top 2, How to Install A, Stick the round: metal piece with adhesive fo the mobile iPhone's batteries and then place the magnetic holder at the best position in the car.