This is a Bob Beck device similar to the BT5. It is housed in a similar 4″x 2″ x 1 (100 x 60 x 25 mm) plastic box. The BT12 has many advanced features not found in the BT5. A Low Power Indicator LED is included…. When this LED lights up, change the battery. There is a voltage booster / regulator. This new and improved power supply method will maintain a constant 9 volts available to the circuitry all the way down to about 2 volts remaining in the Battery. A 12 position Modulation Frequency selector switch includes DELTA 1 & 2, THETA 1 & 2, ALPHA, BETA 1 & 2, GAMMA, HYPER GAMMA 1 & 2, LAMBDA 1 & 2. The Carrier “note” frequency is ADJUSTABLE from approximately 840 to 1000 Hz. (see below for adjusting suggestion). A built in adjustable run time timer, ranging from approximately 5 minutes to 40 minutes. A Blue LED indicates that the unit is running during the selected time period. Glow brighter with higher Power settings and will flash according to the Modulation setting. The Blue LED indicates that the BT12 is providing signal output during the selected time. Note: This LED may go dark during usage, depending on the user’s skin resistance. The Start Button begins the Timed output. An On / Off / Amplitude output control just like in the BT5. Furnished with standard ear clip (same as supplied with the BT5). Powered by a 9 Volt Battery (not supplied). Units are 100% professionally manufactured In the United States of America. Here is a clever way to set the Carrier signal to a given frequency: plug a standard audio headphone in to the ear clip jack (most head phones have a 3.5 mm plug). Set the Modulation to 0.5 Hz (this will allow you to hear the Carrier for one second and then one second of silence, then repeated). Using your computer, go to any on-line signal generator site… Set the desired frequency and adjust your computer’s sound system to a comfortable level. Adjust the Carrier setting knob on the BT12 to cause the same frequency in your headset, as you are hearing from your computer…. Like tuning a guitar or piano with a tuning fork. To understand “carrier” and “modulation”, imagine an organ key being played. For example middle C is 440 Hz. As long as the key is held down, the note heard is the 440 Hz tone. This tone, in this example, is our “Carrier”. Now the organist, being very talented, will hold the key down for ONE second, then release the key for ONE second, then repeat the pattern by holding down the key for One second. This is our “modulation”. Researching the published info on various CES devices reveals that there are many different carrier and modulation frequencies available. Only your research will determine where you choose to set it. The Power Knob is identical in circuit and function as the BT-5, which is detailed in The Bob Beck protocol Handbook at the top of page 73. The BT-12 is basically a BT-5 with added versatility. Ask about quantity discounts. The HS Code is. 8543.70.00.00. The “Brass” label is printed paper… On the 12 position switch is the normal design. It is normal to experience skin irritation. From the ear clips. In the course of using these type of devices. The irritation can be diminished by using pieces of cotton cut from a “facial cleanser make up pad” and soaked in salt water, then placed between the metal electrode of the ear clip and the user’s skin. Answers to many questions can be found in the BOB BECK PROTOCOL HANDBOOK, which is available as a free download in. We will repair or replace at our discretion. I hold several patents in electronic technology. A google search of Frank Jessup patents will give the details. No statement contained in this sale offering, and no information provided by any of our employees. 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