Foc.us headset

Product page

The device is shown in the FCC photos as using... foc.us and "4.0" is silkscreened on the board shown.
 * a Texas Instruments CC254x BT 4.0 LE SoC (CC2540 )
 * an Atmel AT25DF041A 4Mbit (0.5MB) Serial (SPI) Flash
 * an EEMB LP401230 Li-Poly battery (manuf. specified as 95mAh @ 3.7V).

Additional specifications, per the FCC manual, follow...
 * Charging port: USB, Female Micro-B
 * Battery: Li-Poly, 3.7V, 105mAh
 * Dimensions: Dimensions::195mm x 150mm x 58mm
 * Weight: Weight::300 g (headset only)
 * tDCS specs...
 * Max. current: 2.05mA
 * Max. voltage: 60V
 * Sampling rate: 2,000 SPS
 * Bluetooth capability: 4.0 LE (GATT profile)

Addl. external links
Bad flash memory lock setting causing issues - foc.us blog