The EWA(Enhanced Wireless Audio) A104 Bluetooth Speaker is small but powerful, tiny body loud voice. Fabulous small size, until you hear it. Stainless steel shell passive subwoofer , so you can hear something unbelievable Specifications: Colors: blue gold rose gold silver black Battery: 500mA RMS: 3W Frequency: 100-18KHZ SNR: S/N85DB 1. 881. 51(in) Playing time: 4 hours Charge time: 2 hours Bluetooth frequency: 2. 4-2. 48GHz Bluetooth Protocols: HS/HF, A2DP, AVRCP, OPP Notifications: EWA A104 will shut down automatically without any operates in 5 minutes EWA A104 should turn into bluetooth paring mode in case on non Micro SD card inserted, and it will search and pair with previous devices automatically. Next/Prev. Button is not available under Aux-in mode Do not use the speaker with water around it Please clean the speaker only use dry towels Do not put the speaker close to open-flames such as lighted candles It is a duty to protect the environment while you are considering drop the speaker, especially the battery inside The speaker could only use in mild climate conditions User should not try to took the speaker apart, the speaker did not contain any component which could fixed by users.