Specification,
Built-in li-polymer rechargeable battery, 400mAh.
1) Work voltage: 3.6-4.2 V.
2) Work current: <30mA (Bluetooth module).
3) Work current: <400mA (power amplifier, Bluetooth ).
4) Standby current: <3mA.
5) Scope: <10 meters of wireless communication (consistent with the Bluetooth protocol specifications CLASS 2).
6) Transmit power: Class2 less than 4dBm, low radiation.
7) Spread spectrum: Frequency Hopping Spread Spectrum.
8) Bluetooth version: Compatible with V2.1, V2.0, V1.1 and V1.2 standard.
9) Bluetooth protocol support: A2DP, AVRCP.
10) Frequency range: 2.401-2.480 GHz (2.4GHz ISM Segment).
11) The receiver sensitivity: <-90dBm, BER <0.1%.
12) SNR: 95dB.
13) Distortion: <0.2%.
14) Frequency Response: 20Hz-20kHz.
15) Operating temperature: -10 ~ 55 Centigrades.
16) Coincide with IEEE 802.11
17) CE, RoHS, FCC certificated.

Packing Details,
Black gift box
100PCS/carton
Size: 57*39.5*33cm
G. W: 16KG