Functions:
1. VOLUME with power on/ off.
2. MIC: speech input piece.
3. LED: power indicator (faded red means low battery, no light means no battery).
4. PITCH ADJUSTER (8 selection : 3 high, 3 low, one normal, 1ET).

Operations:
1. Put device over mouthpiece, make sure that sound insulator surrounds the mouthpiece.
2. Turn on volume and adjust (change to male-high volume; to female-low volume; ET-lowest volume).
3. Select desired pitch(use the telephone receiver to hear the selection and make changes to satisfaction).
4. Speak into sound input(avoid frequently used speak structure. For best result, fake the voice).
5. When using ET, speak slowly and distinctively. Avoid dragging or linking sounds.

Cautions:
1. If voice changing fails, please check the following:
a. Telephone is steadily placed
b. If the mouthpiece has an irregular shape or if the sound insulator fits over it.
c. Review the instruction.
d. Battery power is full and is inserted.
e. Check voice clarity.
2. Keep device dry. Don not expose to direct sun or open flame.
3. Do not smash device.
4. Do not use this device for unlawful purpose(i.e. Harassing or vengeful conduct).

Applications:
Home ordinary phones
Cordless phones
Office telephones
Walkie Talkies(wireless Transceivers)
Handheld for car\'s talking
Indoor/outdoor intercom phones

NOTE: This case does not come with 9V battery. If you need the battery, please click here for more information.