I think for a start price. So I know how much we are dealling with.
1 BLUETOOTH CHIP 4.0 prepared for use with the Arduino IDE interface.
1 BT antenne
1 AUDIO STEREO HIGH GRADE OUTPUT min. 2x25watt slots
1 USB micro input for charging a li-po 3.7v batt. 8.000mAh
1charger module 1A ?
1 Toggle on/off button
1 Led (RGB)
NO PREMADE MODULES
Calculations and some safety components for prober use.