Bird Sound for exchange

I have numbers of external sound for exchange. Please contact me at fclim69@gmail.com for request the sample and may send me sample of your bird sound to me.

It is mainly for those wish to test out different sound without any cost.

Planned to do series of modification in th BH

After few month there is no progress of the BH, planned series of modification and adjustment on the BH after CNY.
1. Change the internal & external sound
2. Cover one of the side entrance hole
3. Change the external tweeters
4. Placement of new external tweeter