RainbowHeaven only offer Vamo body, you need to buy battery and charger separately.
VAMO support both AVG or RMS,
keep pressing " +" button more than 10sec, if  LCD screen displays 001 means AVG, 002 means RMS, loose the " +" button and keep pressing it more than 10sec, you may change AVG to RMS or RMS to AVG.
Please choose RMS when you use 2pcs batteries, and AVG when using 1pc battery, to ensure you get an accurate output. 
Button colors you may choose:
black, white, red, pink, light blue, orange and metal button(chrome).
Max Amps: 5A, 
Working volt: 3~6.0V, 
Watt: 3~15W. 
Thread: 510/eGo
LCD screen, display working resistance and battery volt,  
you may adjust volt(3.0, 3.1...6.0V) and Watt(3.0, 3.5, 4.0...15W) by your needs. 
The body is separable, Working with: 
2pcs 18350 battery  or 1pc 18650 battery  or 1pc 18350 battery. 
HOW TO USE:  
1. Click the biggest button 5 times, the light will flicker, start to work.

2. Keep pressing the “-”button more than 3 sec, the LCD screen displays the battery voltage. 
Then reduce voltage by pressing – button,increase voltage by pressing “+” button. 
The voltage will increase or reduce with 0.1v standard when you adjust. 
Vapor will be the least once the voltage is 3.0v, and it will be the largest once the voltage is 6.0v. 

3. Keep pressing the + button more than 3sec, LCD screen display the present working resistance. 
4. Keep pressing the - button more than 3sec, LCD screen display battery voltage. 

5. Keep pressing the + and – buttons at the same time, you may adjust the watt by + and - button from 3.0W to 15.0W by 0.5W. 

Once LCD display"LO-V" means:
1: you have to stop using Vamo and batteries need to be charged.
2: Short circuit. Vamo come with protection system, just change a
new atomizer problem will be solved.

The before Vamo has a little connection problem when you use 18650 flat tip battery, RainbowHeaven updated the spring and all Vamo from today(18th Nov. 2012) will be the updated one, no connection problem any more.
Also  RainbowHeaven added a small, thin, red insulator at the end of "+" pole connection, to avoid short circuit.
Sorry for the before problem brought to you, enjoy your shopping and vaping. 
RainbowHeaven refuse any group buying activity but only offer to retailers, sorry for any inconvenience and appreciate for your understanding.