Bluetooth version: V2.1 class2 - Bluetooth profiles: A2DP/AVRCP/HFP - Transmission range: 10m - Frequency range: 2.400-2.480GHz - RF output power: 4dBm - Built-in 3.7V 500mAh lithium battery - Charging time: 2.5~3 hours - Talk time: 4 hours - MP3/FM playing time: 4 hours - Standby time: 3 days - Working temperature: -10 ~ +44'C - Supports MP3 music format - Supports TF card up to 8GB - FM range: 87.5~108MHz - Package includes: - 1 x MP3 Bluetooth headset - 1 x AC 100~240V power adapter (2-round-pin plug) - 1 x USB Cable - 1 x English/Chinese user manual